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920: 478: 29: 915:{\displaystyle {\begin{aligned}\Gamma (g)_{ij}^{k}&={\frac {1}{2}}\sum _{\ell =1}^{m}g^{k\ell }{\Big (}{\frac {\partial g_{j\ell }}{\partial x^{i}}}+{\frac {\partial g_{i\ell }}{\partial x^{j}}}-{\frac {\partial g_{ij}}{\partial x^{\ell }}}{\Big )}\\\Gamma (h)_{\alpha \beta }^{\gamma }&={\frac {1}{2}}\sum _{\delta =1}^{n}h^{\gamma \delta }{\Big (}{\frac {\partial h_{\beta \delta }}{\partial y^{\alpha }}}+{\frac {\partial h_{\alpha \delta }}{\partial y^{\beta }}}-{\frac {\partial h_{\alpha \beta }}{\partial y^{\delta }}}{\Big )}\end{aligned}}} 1313: 980: 4203: 2194: 1308:{\displaystyle \nabla (df)_{ij}^{\alpha }={\frac {\partial ^{2}f^{\alpha }}{\partial x^{i}\partial x^{j}}}-\sum _{k=1}^{m}\Gamma (g)_{ij}^{k}{\frac {\partial f^{\alpha }}{\partial x^{k}}}+\sum _{\beta =1}^{n}\sum _{\gamma =1}^{n}{\frac {\partial f^{\beta }}{\partial x^{i}}}{\frac {\partial f^{\gamma }}{\partial x^{j}}}\Gamma (h)_{\beta \gamma }^{\alpha }\circ f.} 4408: 3992: 2733: 3754:
to a harmonic map. The very existence of a harmonic map in each homotopy class, which is implicitly being asserted, is part of the result. This is proven by constructing a heat equation, and showing that for any map as initial condition, solution that exists for all time, and the solution uniformly
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and a smooth stone can both be naturally viewed as Riemannian manifolds. Any way of stretching the rubber band over the stone can be viewed as a mapping between these manifolds, and the total tension involved is represented by the Dirichlet energy. Harmonicity of such a mapping means that, given any
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must be biholomorphic or anti-biholomorphic if they are homotopic to each other; the biholomorphism (or anti-biholomorphism) is precisely the harmonic map produced as the limit of the harmonic map heat flow with initial data given by the homotopy. By an alternative formulation of the same approach,
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extended their methods to study uniqueness of harmonic maps within homotopy classes, additionally showing that the convergence in the Eells−Sampson theorem is strong, without the need to select a subsequence. That is, if two maps are initially close, the distance between the corresponding solutions
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was necessary. Following the work of Kung-Ching Chang, Wei-Yue Ding, and Rugang Ye in 1992, it is widely accepted that the maximal time of existence of a harmonic map heat flow cannot "usually" be expected to be infinite. Their results strongly suggest that there are harmonic map heat flows with
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are taken to be the two-dimensional sphere with its standard metric. Since elliptic and parabolic partial differential equations are particularly smooth when the domain is two dimensions, the Chang−Ding−Ye result is considered to be indicative of the general character of the flow.
4232: 4198:{\displaystyle {\Big (}{\frac {\partial }{\partial t}}-\Delta ^{g}{\Big )}e(f)=-{\big |}\nabla (df){\big |}^{2}-{\big \langle }\operatorname {Ric} ^{g},f^{\ast }h{\big \rangle }_{g}+\operatorname {scal} ^{g}{\big (}f^{\ast }\operatorname {Rm} ^{h}{\big )}.} 2546: 1466: 3928:
of the harmonic map heat flow. Moreover, he found that his weak solutions are smooth away from finitely many spacetime points at which the energy density concentrates. On microscopic levels, the flow near these points is modeled by a
1905: 2189:{\displaystyle {\frac {1}{2}}\sum _{i=1}^{m}\sum _{j=1}^{m}\sum _{\alpha =1}^{n}\sum _{\beta =1}^{n}g^{ij}{\frac {\partial f^{\alpha }}{\partial x^{i}}}{\frac {\partial f^{\beta }}{\partial x^{j}}}(h_{\alpha \beta }\circ f).} 3941:
at singular times, meaning that the Dirichlet energy of Struwe's weak solution, at a singular time, drops by exactly the sum of the total Dirichlet energies of the bubbles corresponding to singularities at that time.
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must be holomorphic, provided that the target manifold has appropriately negative curvature. As an application, by making use of the Eells−Sampson existence theorem for harmonic maps, he was able to show that if
4403:{\displaystyle \Delta ^{g}e(f)={\big |}\nabla (df){\big |}^{2}+{\big \langle }\operatorname {Ric} ^{g},f^{\ast }h{\big \rangle }_{g}-\operatorname {scal} ^{g}{\big (}f^{\ast }\operatorname {Rm} ^{h}{\big )}.} 4611:
The general idea of deforming a general map to a harmonic map, and then showing that any such harmonic map must automatically be of a highly restricted class, has found many applications. For instance,
3332: 191:, has been particularly influential, as their analysis has been adapted to many other geometric contexts. Notably, Uhlenbeck's parallel discovery of bubbling of Yang–Mills fields is important in 483: 2358: 5419: 4751:
One of the original ideas in grid generation methods for computational fluid dynamics and computational physics was to use either conformal or harmonic mapping to generate regular grids.
4829: 2728:{\displaystyle \int _{M}{\frac {\partial }{\partial s}}{\Big |}_{s=0}e(f_{s})\,d\mu _{g}=-\int _{M}h\left({\frac {\partial }{\partial s}}{\Big |}_{s=0}f_{s},\Delta f\right)\,d\mu _{g}} 153:
hypothetical way of physically deforming the given stretch, the tension (when considered as a function of time) has first derivative equal to zero when the deformation begins.
4785: 4855: 4701:. By an extension of the Eells−Sampson theorem together with an extension of the Siu–Corlette Bochner formula, they were able to prove new rigidity theorems for lattices. 1344: 3813: 215:
and Uhlenbeck to study the regularity theory of harmonic maps have likewise been the inspiration for the development of many analytic methods in geometric analysis.
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This means that, relative to any local coordinate charts, one has uniform convergence on compact sets of the functions and their first partial derivatives.
5744: 5459: 3953:. Their results achieved less than in low dimensions, only being able to prove existence of weak solutions which are smooth on open dense subsets. 2759:
of the Dirichlet energy; correspondingly, a harmonic map is a critical point of the Dirichlet energy. This can be done formally in the language of
6900:. Appunti. Scuola Normale Superiore di Pisa (Nuova Serie). Vol. 11 (Second edition of 2005 original ed.). Pisa: Edizioni della Normale. 5079:{\displaystyle e_{\epsilon }(u)(x)={\frac {\int _{M}d^{2}(u(x),u(y))\,d\mu _{x}^{\epsilon }(y)}{\int _{M}d^{2}(x,y)\,d\mu _{x}^{\epsilon }(y)}}} 6128: 6854: 6812: 3288: 7165: 7115: 6967: 6913: 5629: 3024:
being geodesic, although this does not imply that it is a constant-speed parametrization, and hence does not imply that
7202:. Conference Proceedings and Lecture Notes in Geometry and Topology. Vol. 2. Cambridge, MA: International Press. 7311: 7257: 7207: 7065: 7023: 6780: 6730: 6680: 6554: 6454: 72: 50: 43: 7354: 6608: 6406: 6342: 5877: 3863:
For many years after Eells and Sampson's work, it was unclear to what extent the sectional curvature assumption on
2295: 6452:(1976). "Harmonic maps and the topology of stable hypersurfaces and manifolds with non-negative Ricci curvature". 6182: 6070: 4790: 6115: 6714: 5724: 98: 5499: 7369: 6947: 5203: 3763: 4616:
found an important complex-analytic version of the Bochner formula, asserting that a harmonic map between
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Struwe was later able to adapt his methods to higher dimensions, in the case that the domain manifold is
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Eells and Sampson introduced the harmonic map heat flow and proved the following fundamental properties:
6502:(1980). "The complex-analyticity of harmonic maps and the strong rigidity of compact KĂ€hler manifolds". 5519: 3597:
as in the statement of the existence theorem, and it is uniquely defined under the extra criterion that
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Once existence is known, how can a harmonic map be constructed explicitly? (One fruitful method uses
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is a closed Riemannian manifold with nonpositive sectional curvature, then every continuous map from
3079: 4834: 1461:{\displaystyle (\Delta f)^{\alpha }=\sum _{i=1}^{m}\sum _{j=1}^{m}g^{ij}\nabla (df)_{ij}^{\alpha }.} 5291: 4711: 251:) is defined via the second fundamental form, and its vanishing is the condition for the map to be 37: 5367: 3961:
The main computational point in the proof of Eells and Sampson's theorem is an adaptation of the
2914: 200: 102: 6993: 6124:"Harmonic maps into singular spaces and p-adic superrigidity for lattices in groups of rank one" 4673:
Kevin Corlette found a significant extension of Siu's Bochner formula, and used it to prove new
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An introduction to the regularity theory for elliptic systems, harmonic maps and minimal graphs
3792: 1724: 1613: 1526: 54: 5630:"Local splitting structures on nonpositively curved manifolds and semirigidity in dimension 3" 2258:-trace of the first fundamental form. Regardless of the perspective taken, the energy density 16:
This article is about harmonic maps between Riemannian manifolds. For harmonic functions, see
7240:. Lectures in Mathematics ETH ZĂŒrich. Based on lecture notes by Norbert HungerbĂŒhler. Basel: 6504: 6283: 5969: 5580: 5259: 5101: 86: 7321: 7267: 7217: 7175: 7125: 7075: 6997: 6977: 6923: 6875: 6833: 6790: 6740: 6690: 6631: 6575: 6533: 6475: 6429: 6365: 6312: 6253: 6205: 6149: 6099: 6045: 5998: 5943: 5900: 5179: 4729: 4484: 3962: 2493:; one supposes that the parametrized family is smooth in the sense that the associated map 1625: 334: 7329: 7275: 7241: 7225: 7183: 7133: 7083: 7049: 7033: 6985: 6931: 6883: 6841: 6798: 6748: 6698: 6639: 6591: 6541: 6491: 6437: 6373: 6320: 6269: 6221: 6165: 6107: 6053: 6006: 5959: 5908: 1900:{\displaystyle (\Delta f)_{p}=\sum _{i=1}^{m}{\big (}\nabla (df){\big )}_{p}(e_{i},e_{i})} 8: 6939: 4725: 4422: 3759: 3638: 3101: 2948: 2381: 1501: 224: 204: 187:
The discovery of the "bubbling" of sequences of harmonic maps, due to Jonathan Sacks and
169: 114: 90: 5920:(1989). "Existence and partial regularity results for the heat flow for harmonic maps". 6579: 6521: 6479: 6300: 6257: 6209: 6153: 6087: 5986: 5947: 5592: 5311: 3838: 3818: 434: 208: 181: 4617: 3933:, i.e. a smooth harmonic map from the round 2-sphere into the target. Weiyue Ding and 3090: 7307: 7253: 7203: 7161: 7111: 7061: 7019: 6963: 6909: 6893: 6776: 6726: 6676: 6583: 6483: 6261: 6157: 6123: 6065: 5649: 5610: 3835:
is homotopic to a map, such that the map is totally geodesic when restricted to each
3097: 2385: 2254:. It is also possible to consider the energy density as being given by (half of) the 391: 228: 161: 118: 17: 6213: 5951: 4226:
solution of the harmonic map heat flow, and so one gets from the above formula that
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is two-dimensional, he established the unconditional existence and uniqueness for
7317: 7263: 7213: 7171: 7121: 7071: 6973: 6951: 6919: 6871: 6829: 6786: 6736: 6686: 6664: 6627: 6571: 6529: 6471: 6425: 6397: 6361: 6333: 6308: 6278: 6249: 6201: 6145: 6095: 6041: 5994: 5939: 5896: 4576:
In combination with the Eells−Sampson theorem, this shows (for instance) that if
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is harmonic; this follows directly from the above definitions. As special cases:
2764: 2760: 342: 276: 192: 188: 180:, in and of themselves, are among the most widely studied topics in the field of 7349: 7344: 7286:(1982). "Survey on partial differential equations in differential geometry". In 6713:. CBMS Regional Conference Series in Mathematics. Vol. 50. Providence, RI: 5645: 4710:
Existence results on harmonic maps between manifolds has consequences for their
7287: 7283: 7195: 7191: 7099: 6599: 6549: 6449: 6445: 6393: 6329: 6173: 6119: 5917: 5117: 4718: 4476: 4472: 3905: 3774: 232: 212: 7303: 7249: 7107: 7091: 7057: 7041: 6905: 6672: 6229: 6036: 6019: 7363: 7015: 6656: 6622: 6603: 6420: 6401: 6384: 6356: 6337: 5967:
Corlette, Kevin (1992). "Archimedean superrigidity and hyperbolic geometry".
5891: 5872: 5660: 5653: 5614: 5163: 4674: 3925: 2208: 1572: 1530: 6867: 6499: 6196: 6177: 4880: 4698: 4613: 1779:. By the definition of the trace operator, the laplacian may be written as 1671: 7157: 6825: 6772: 3782:
the set of totally geodesic maps in each homotopy class is path-connected;
7141: 7003: 6849: 6807: 6756: 6706: 6061: 4741: 4685:
and Richard Schoen extended much of the theory of harmonic maps to allow
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for the Dirichlet energy compute the derivatives of the Dirichlet energy
164:, who showed that in certain geometric contexts, arbitrary maps could be 157: 149: 6552:(1985). "On the evolution of harmonic mappings of Riemannian surfaces". 6129:
Publications MathĂ©matiques de l'Institut des Hautes Études Scientifiques
6020:"Energy identity for a class of approximate harmonic maps from surfaces" 4865:
The energy integral can be formulated in a weaker setting for functions
7233: 6959: 6722: 6567: 6525: 6467: 6304: 6245: 6141: 6091: 5990: 5935: 5606: 4745: 3609:
The primary result of Eells and Sampson's 1964 paper is the following:
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is used to refer to the standard Riemannian metric on Euclidean space.
173: 101:. This partial differential equation for a mapping also arises as the 7002:. Cambridge Tracts in Mathematics. Vol. 150. With a foreword by 6015: 5873:"Finite-time blow-up of the heat flow of harmonic maps from surfaces" 5141: 5139: 5137: 4678: 3934: 6517: 6296: 6083: 5982: 5597: 4496:
must be constant. In summary, according to these results, one has:
4488: 3751: 3000: 2756: 272: 165: 110: 109:. As such, the theory of harmonic maps contains both the theory of 5134: 4588:
is a closed Riemannian manifold with positive Ricci curvature and
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are two harmonic map heat flows as in the existence theorem, then
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is deformed. To this end, consider a one-parameter family of maps
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is compact; however, then the Dirichlet energy could be infinite.
2227:, and so one may define the energy density as the smooth function 2199:
Alternatively, in the bundle formalism, the Riemannian metrics on
6402:"Boundary regularity and the Dirichlet problem for harmonic maps" 7238:
Theorems on regularity and singularity of energy minimizing maps
4645:
are smooth and closed KĂ€hler manifolds, and if the curvature of
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be smooth and closed Riemannian manifolds, and suppose that the
3078:. This coincides with the notion of harmonicity provided by the 255:. The definitions extend without modification to the setting of 7294:. Annals of Mathematics Studies. Vol. 102. Princeton, NJ: 1961:
From the perspective of local coordinates, as given above, the
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between Riemannian manifolds is totally geodesic if, whenever
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takes on its maximal possible value, which could be infinite.
1956: 97:
if its coordinate representatives satisfy a certain nonlinear
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is harmonic; any harmonic map can be viewed as a constant-in-
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This is also of interest in analyzing harmonic maps. Suppose
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all harmonic maps are energy-minimizing and totally geodesic.
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is nonpositive. Then for any continuously differentiable map
7098:. Universitext (Seventh edition of 1995 original ed.). 6281:(1981). "The existence of minimal immersions of 2-spheres". 5628:
Cao, Jianguo; Cheeger, Jeff; Rong, Xiaochun (January 2004).
5560: 5581:"Totally geodesic maps into manifolds with no focal points" 3904:
Modeled upon the fundamental works of Sacks and Uhlenbeck,
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As a consequence of the uniqueness theorem, there exists a
5279: 4883:. The energy integrand is instead a function of the form 4670:, albeit in the restricted context of negative curvature. 4483:
by making use of Yau's theorem asserting that nonnegative
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to the heat equation is nonincreasing for all time, thus:
3341:
Regularity. Any harmonic map heat flow is smooth as a map
3327:{\displaystyle {\frac {\partial f}{\partial t}}=\Delta f.} 3236:
is differentiable, and its derivative at a given value of
6852:; Lemaire, L. (1988). "Another report on harmonic maps". 6234:
Calculus of Variations and Partial Differential Equations
5487: 5151: 3949:; he and Yun Mei Chen also considered higher-dimensional 3726:
In particular, this shows that, under the assumptions on
218: 6604:"On the evolution of harmonic maps in higher dimensions" 5836: 4479:
noted that this reasoning can be extended to noncompact
7006:(Second edition of 1997 original ed.). Cambridge: 390:
matrix is symmetric and positive-definite. Denote the
168:
into harmonic maps. Their work was the inspiration for
5712: 4860: 4666:
Siu was able to prove a variant of the still-unsolved
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has finite Dirichlet energy, then it must be constant.
7046:
Nonpositive curvature: geometric and analytic aspects
6068:(1964). "Harmonic mappings of Riemannian manifolds". 5871:
Chang, Kung-Ching; Ding, Wei Yue; Ye, Rugang (1992).
4892: 4837: 4793: 4761: 4524:
be smooth and complete Riemannian manifolds, and let
4235: 3995: 3908:
considered the case where no geometric assumption on
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Due to the first variation formula, the Laplacian of
2549: 2298: 1982: 1788: 1347: 983: 481: 156:
The theory of harmonic maps was initiated in 1964 by
5824: 5688: 2739:
There is also a version for manifolds with boundary.
2388:, it is not necessary to place the restriction that 6892: 6810:; Lemaire, L. (1978). "A report on harmonic maps". 3956: 3858: 3409:Existence. Given a continuously differentiable map 7146:The analysis of harmonic maps and their heat flows 6999:Harmonic maps, conservation laws and moving frames 6232:(1994). "Equilibrium maps between metric spaces". 5700: 5676: 5078: 4849: 4823: 4779: 4402: 4197: 3847: 3827: 3807: 3326: 2727: 2352: 2188: 1899: 1460: 1307: 914: 4033: 3998: 2670: 2578: 903: 779: 690: 566: 144:in allocating each of its elements to a point of 7361: 4744:. In such a theory, harmonic maps correspond to 3576:, meaning that one has a harmonic map heat flow 6392: 6327: 5812: 5173: 5169: 937:, its second fundamental form defines for each 6663:. Springer Monographs in Mathematics. Berlin: 6661:Some nonlinear problems in Riemannian geometry 6276: 5627: 5157: 3604: 223:Here the geometry of a smooth mapping between 124:Informally, the Dirichlet energy of a mapping 7048:. Lectures in Mathematics ETH ZĂŒrich. Basel: 4456:and a single integration by parts shows that 4392: 4365: 4336: 4302: 4286: 4263: 4187: 4160: 4131: 4097: 4081: 4058: 2799:be smooth Riemannian manifolds. The notation 2446:for which there exists a precompact open set 2353:{\displaystyle E(f)=\int _{M}e(f)\,d\mu _{g}} 1857: 1834: 6848: 6806: 6755: 6705: 6114: 6060: 5842: 5782: 5754: 5730: 5533: 5529: 5509: 5505: 5477: 5473: 5469: 5437: 5433: 5429: 5405: 5401: 5397: 5377: 5373: 5345: 5341: 5317: 5301: 5297: 5285: 5269: 5265: 5245: 5241: 5237: 5217: 5213: 5145: 4704: 2770: 6855:Bulletin of the London Mathematical Society 6813:Bulletin of the London Mathematical Society 5870: 5666: 5585:Bulletin of the London Mathematical Society 4540:is positive and the sectional curvature of 3965:to the setting of a harmonic map heat flow 3770:is instead compact with nonempty boundary. 1957:Dirichlet energy and its variation formulas 195:'s work on four-dimensional manifolds, and 136:can be thought of as the total amount that 7096:Riemannian geometry and geometric analysis 5915: 5718: 4824:{\displaystyle \gamma :(a,b)\rightarrow M} 3758:Eells and Sampson's result was adapted by 3028:solves the geodesic differential equation. 1712:. This section is known as the hessian of 1635:, which is a section of the vector bundle 7190: 6621: 6444: 6419: 6355: 6195: 6035: 5890: 5806: 5596: 5453: 5413: 5361: 5045: 4980: 3570:harmonic map heat flow with initial data 3108: 3059:component functions are harmonic as maps 2711: 2614: 2336: 73:Learn how and when to remove this message 6944:Harmonic Maps of Manifolds with Boundary 6938: 6013: 5966: 5830: 5734: 5694: 5554: 5493: 5321: 5305: 5273: 5249: 5221: 4467:must be constant, and hence zero; hence 3773:Shortly after Eells and Sampson's work, 36:This article includes a list of general 7140: 6338:"A regularity theory for harmonic maps" 6172: 6024:Communications in Analysis and Geometry 5794: 5766: 5738: 5670: 5634:Communications in Analysis and Geometry 5566: 5513: 5449: 5357: 5253: 5197: 4429:is nonpositive, then this implies that 3055:is harmonic if and only if each of its 3014:is one-dimensional, then minimality of 7362: 7355:The Bibliography of Harmonic Morphisms 6992: 6598: 6548: 5706: 5682: 5578: 5441: 5349: 5189: 4536:. Suppose that the Ricci curvature of 219:Geometry of mappings between manifolds 7232: 6655: 5778: 5750: 5525: 5465: 5425: 5393: 5337: 5233: 5209: 5185: 3665:, the maximal harmonic map heat flow 7090: 7040: 6228: 5854: 5790: 5786: 5762: 5758: 5481: 5445: 5409: 5381: 5353: 5325: 5193: 3876:"finite-time blowup" even when both 3789:notes that every map from a product 2973:is a constant-speed immersion, then 2273:which is smooth and nonnegative. If 368:be a smooth real-valued function on 312:be a smooth real-valued function on 262: 22: 7282: 6498: 5818: 4861:Harmonic maps between metric spaces 1735:, which is a section of the bundle 1471: 176:. Harmonic maps and the associated 13: 6950:. Vol. 471. Berlin–New York: 4445:is closed, then multiplication by 4268: 4237: 4063: 4022: 4009: 4005: 3315: 3303: 3295: 3282:. This is usually abbreviated as: 3142:be smooth Riemannian manifolds. A 2700: 2658: 2654: 2566: 2562: 2142: 2127: 2108: 2093: 1839: 1792: 1748:; this says that the laplacian of 1425: 1351: 1269: 1253: 1238: 1219: 1204: 1140: 1125: 1095: 1055: 1042: 1021: 984: 885: 867: 845: 827: 805: 787: 699: 672: 654: 632: 614: 592: 574: 486: 203:is significant in applications to 199:'s later discovery of bubbling of 42:it lacks sufficient corresponding 14: 7391: 7338: 6555:Commentarii Mathematici Helvetici 6455:Commentarii Mathematici Helvetici 3423:, there exists a positive number 3113: 7292:Seminar on Differential Geometry 6711:Selected topics in harmonic maps 6609:Journal of Differential Geometry 6407:Journal of Differential Geometry 6343:Journal of Differential Geometry 5878:Journal of Differential Geometry 4780:{\displaystyle u:M\rightarrow N} 4657:is appropriately negative, then 3957:The Bochner formula and rigidity 3859:Singularities and weak solutions 3764:Dirichlet boundary value problem 3755:subconverges to a harmonic map. 3716:subsequentially converge in the 1760:an element of the tangent space 235:. Such a mapping defines both a 27: 6183:Canadian Journal of Mathematics 6071:American Journal of Mathematics 5621: 5572: 5539: 4831:is a geodesic, the composition 1969:is the real-valued function on 1662:; this is to say that for each 1552:; this is to say that for each 1318:Its laplacian defines for each 148:. For instance, an unstretched 5070: 5064: 5042: 5030: 5005: 4999: 4977: 4974: 4968: 4959: 4953: 4947: 4918: 4912: 4909: 4903: 4850:{\displaystyle u\circ \gamma } 4815: 4812: 4800: 4771: 4280: 4271: 4255: 4249: 4075: 4066: 4047: 4041: 2611: 2598: 2333: 2327: 2308: 2302: 2180: 2158: 1894: 1868: 1851: 1842: 1799: 1789: 1731:to arrive at the laplacian of 1438: 1428: 1358: 1348: 1279: 1272: 1105: 1098: 997: 987: 709: 702: 496: 489: 1: 6715:American Mathematical Society 5123: 3427:and a harmonic map heat flow 3193:in such a way that, for each 99:partial differential equation 85:In the mathematical field of 6948:Lecture Notes in Mathematics 6761:Two reports on harmonic maps 6178:"On homotopic harmonic maps" 4608:is homotopic to a constant. 7: 6896:; Martinazzi, Luca (2012). 5646:10.4310/CAG.2004.v12.n1.a17 5579:Dibble, James (June 2019). 5174:Schoen & Uhlenbeck 1983 5170:Schoen & Uhlenbeck 1982 5111: 3722:topology to a harmonic map. 3605:Eells and Sampson's theorem 3174:a twice-differentiable map 2995:is harmonic if and only if 2943:is harmonic if and only if 257:pseudo-Riemannian manifolds 128:from a Riemannian manifold 105:of a functional called the 10: 7396: 7350:Harmonic Maps Bibliography 7296:Princeton University Press 7008:Cambridge University Press 5158:Sacks & Uhlenbeck 1981 5104:attached to each point of 3920:is made. In the case that 3750:, every continuous map is 3405:is geodesically complete. 15: 7304:10.1515/9781400881918-002 7250:10.1007/978-3-0348-9193-6 7200:Lectures on harmonic maps 7144:; Wang, Changyou (2008). 7108:10.1007/978-3-319-61860-9 7058:10.1007/978-3-0348-8918-6 6906:10.1007/978-88-7642-443-4 6803:Consists of reprints of: 6673:10.1007/978-3-662-13006-3 6037:10.4310/CAG.1995.v3.n4.a1 5923:Mathematische Zeitschrift 5667:Chang, Ding & Ye 1992 4705:Problems and applications 4471:must itself be constant. 3808:{\displaystyle W\times M} 3393:is a closed manifold and 3080:Laplace-Beltrami operator 2771:Examples of harmonic maps 2755:can be thought of as the 2746:second variation formula. 1326:the real-valued function 957:the real-valued function 211:. The techniques used by 132:to a Riemannian manifold 7016:10.1017/CBO9780511543036 5843:Gromov & Schoen 1992 5783:Eells & Sampson 1964 5755:Eells & Sampson 1964 5731:Eells & Sampson 1964 5534:Eells & Lemaire 1983 5530:Eells & Lemaire 1978 5510:Eells & Lemaire 1983 5506:Eells & Lemaire 1978 5478:Eells & Sampson 1964 5474:Eells & Lemaire 1983 5470:Eells & Lemaire 1978 5438:Eells & Sampson 1964 5434:Eells & Lemaire 1983 5430:Eells & Lemaire 1978 5406:Eells & Sampson 1964 5402:Eells & Lemaire 1983 5398:Eells & Lemaire 1978 5378:Eells & Lemaire 1983 5374:Eells & Lemaire 1978 5346:Eells & Lemaire 1983 5342:Eells & Lemaire 1978 5318:Eells & Lemaire 1978 5302:Eells & Sampson 1964 5298:Eells & Lemaire 1978 5286:Eells & Lemaire 1983 5270:Eells & Lemaire 1983 5266:Eells & Lemaire 1978 5246:Eells & Sampson 1964 5242:Eells & Lemaire 1983 5238:Eells & Lemaire 1978 5218:Eells & Lemaire 1983 5214:Eells & Lemaire 1978 5146:Eells & Sampson 1964 4677:for lattices in certain 2380:. Since any nonnegative 241:second fundamental form. 201:pseudoholomorphic curves 7345:MathWorld: Harmonic map 6759:; Lemaire, Luc (1995). 6709:; Lemaire, Luc (1983). 4528:be a harmonic map from 3937:were able to prove the 2535:first variation formula 1614:Levi-Civita connections 1560:, one has a linear map 1516:, one can consider its 231:and, equivalently, via 172:'s initial work on the 103:Euler-Lagrange equation 89:, a smooth map between 57:more precise citations. 6623:10.4310/jdg/1214442475 6421:10.4310/jdg/1214437663 6385:10.4310/jdg/1214437667 6357:10.4310/jdg/1214436923 6197:10.4153/cjm-1967-062-6 5892:10.4310/jdg/1214448751 5719:Chen & Struwe 1989 5080: 4851: 4825: 4781: 4574: 4404: 4199: 3849: 3829: 3809: 3762:to the setting of the 3724: 3328: 3144:harmonic map heat flow 3109:Harmonic map heat flow 3003:differential equation. 2729: 2372:is the volume form on 2354: 2190: 2076: 2055: 2034: 2013: 1939:-orthonormal basis of 1901: 1831: 1624:. So one may take the 1462: 1411: 1390: 1309: 1200: 1179: 1094: 916: 763: 550: 237:first fundamental form 178:harmonic map heat flow 7158:10.1142/9789812779533 6868:10.1112/blms/20.5.385 6773:10.1142/9789812832030 6505:Annals of Mathematics 6284:Annals of Mathematics 5970:Annals of Mathematics 5807:Schoen & Yau 1976 5454:Schoen & Yau 1997 5414:Schoen & Yau 1997 5362:Schoen & Yau 1997 5081: 4852: 4826: 4782: 4556:are both closed then 4498: 4485:subharmonic functions 4405: 4200: 3850: 3830: 3810: 3611: 3329: 2955:. As a special case: 2730: 2355: 2191: 2056: 2035: 2014: 1993: 1902: 1811: 1504:. Given a smooth map 1463: 1391: 1370: 1310: 1180: 1159: 1074: 917: 743: 530: 372:, such that for each 316:, such that for each 285:be an open subset of 87:differential geometry 6940:Hamilton, Richard S. 5797:, Proposition 1.5.2. 5695:Ding & Tian 1995 5516:, Proposition 1.6.2. 5468:, Proposition 10.2; 4890: 4835: 4791: 4759: 4730:quantum field theory 4697:to be replaced by a 4421:is positive and the 4233: 3993: 3986:. This formula says 3839: 3819: 3793: 3289: 3102:Riemannian manifolds 2547: 2296: 1980: 1786: 1626:covariant derivative 1592:. The vector bundle 1502:Riemannian manifolds 1345: 981: 479: 225:Riemannian manifolds 111:unit-speed geodesics 91:Riemannian manifolds 7370:Riemannian geometry 6826:10.1112/blms/10.1.1 5795:Lin & Wang 2008 5793:, Corollary 9.2.3; 5781:, Corollary 10.12; 5767:Lin & Wang 2008 5739:Lin & Wang 2008 5671:Lin & Wang 2008 5528:, Definition 10.3; 5514:Lin & Wang 2008 5450:Lin & Wang 2008 5428:, Definition 10.1; 5396:, Definition 10.1; 5358:Lin & Wang 2008 5340:, Definition 10.1; 5254:Lin & Wang 2008 5236:, Definition 10.2; 5198:Lin & Wang 2008 5063: 4998: 4726:theoretical physics 4441:is nonnegative. If 4423:sectional curvature 3939:energy quantization 3639:sectional curvature 3240:is, as a vector in 2847:, the constant map 2384:has a well-defined 2382:measurable function 1454: 1295: 1121: 1013: 925:Given a smooth map 725: 512: 435:Christoffel symbols 380:, one has that the 324:, one has that the 205:symplectic geometry 115:Riemannian geometry 7380:Analytic functions 7375:Harmonic functions 7148:. Hackensack, NJ: 6960:10.1007/BFb0087227 6894:Giaquinta, Mariano 6763:. River Edge, NJ: 6568:10.1007/BF02567432 6468:10.1007/BF02568161 6246:10.1007/BF01191341 6142:10.1007/bf02699433 5936:10.1007/BF01161997 5765:, Formula 9.2.13; 5761:, Formula 5.1.18; 5607:10.1112/blms.12241 5076: 5049: 4984: 4847: 4821: 4777: 4681:. Following this, 4400: 4195: 3845: 3825: 3805: 3686:with initial data 3324: 2725: 2397:variation formulas 2350: 2186: 1897: 1686:of tangent spaces 1458: 1437: 1305: 1278: 1104: 996: 912: 910: 708: 495: 227:is considered via 209:quantum cohomology 182:geometric analysis 119:harmonic functions 117:and the theory of 7298:. pp. 3–71. 7242:BirkhĂ€user Verlag 7167:978-981-277-952-6 7117:978-3-319-61859-3 7050:BirkhĂ€user Verlag 6969:978-3-540-07185-3 6915:978-88-7642-442-7 6649:Books and surveys 6508:. Second Series. 6287:. Second Series. 5973:. Second Series. 5857:, Definition 1.1. 5789:, Theorem 5.1.2; 5484:, Formula 9.1.13. 5074: 4675:rigidity theorems 4560:must be constant. 4016: 3848:{\displaystyle M} 3828:{\displaystyle N} 3389:Now suppose that 3310: 3098:harmonic morphism 3018:is equivalent to 2874:The identity map 2665: 2573: 2386:Lebesgue integral 2269:is a function on 2156: 2122: 1991: 1612:induced from the 1267: 1233: 1154: 1069: 899: 859: 819: 741: 686: 646: 606: 528: 343:positive-definite 263:Local coordinates 229:local coordinates 83: 82: 75: 18:harmonic function 7387: 7333: 7279: 7229: 7187: 7150:World Scientific 7137: 7087: 7037: 6994:HĂ©lein, FrĂ©dĂ©ric 6989: 6935: 6887: 6845: 6802: 6765:World Scientific 6752: 6723:10.1090/cbms/050 6702: 6643: 6625: 6595: 6545: 6495: 6441: 6423: 6398:Uhlenbeck, Karen 6389: 6388: 6377: 6359: 6334:Uhlenbeck, Karen 6324: 6273: 6225: 6199: 6169: 6111: 6062:Eells, James Jr. 6057: 6039: 6030:(3–4): 543–554. 6010: 5963: 5912: 5894: 5858: 5852: 5846: 5840: 5834: 5828: 5822: 5816: 5810: 5804: 5798: 5776: 5770: 5769:, Theorem 1.5.1. 5748: 5742: 5728: 5722: 5716: 5710: 5704: 5698: 5692: 5686: 5680: 5674: 5664: 5658: 5657: 5625: 5619: 5618: 5600: 5576: 5570: 5564: 5558: 5552: 5546: 5543: 5537: 5523: 5517: 5503: 5497: 5491: 5485: 5463: 5457: 5423: 5417: 5391: 5385: 5371: 5365: 5335: 5329: 5315: 5309: 5295: 5289: 5283: 5277: 5263: 5257: 5231: 5225: 5207: 5201: 5183: 5177: 5167: 5161: 5155: 5149: 5143: 5099: 5098: 5085: 5083: 5082: 5077: 5075: 5073: 5062: 5057: 5029: 5028: 5019: 5018: 5008: 4997: 4992: 4946: 4945: 4936: 4935: 4925: 4902: 4901: 4878: 4857:is a geodesic. 4856: 4854: 4853: 4848: 4830: 4828: 4827: 4822: 4786: 4784: 4783: 4778: 4738:Dirichlet energy 4736:is given by the 4696: 4668:Hodge conjecture 4664: 4660: 4656: 4644: 4632: 4618:KĂ€hler manifolds 4607: 4603: 4599: 4587: 4570: 4566: 4559: 4555: 4551: 4544:is nonpositive. 4543: 4539: 4535: 4531: 4527: 4523: 4511: 4493: 4482: 4470: 4466: 4455: 4444: 4440: 4428: 4420: 4409: 4407: 4406: 4401: 4396: 4395: 4389: 4388: 4379: 4378: 4369: 4368: 4359: 4358: 4346: 4345: 4340: 4339: 4329: 4328: 4316: 4315: 4306: 4305: 4296: 4295: 4290: 4289: 4267: 4266: 4245: 4244: 4225: 4221: 4204: 4202: 4201: 4196: 4191: 4190: 4184: 4183: 4174: 4173: 4164: 4163: 4154: 4153: 4141: 4140: 4135: 4134: 4124: 4123: 4111: 4110: 4101: 4100: 4091: 4090: 4085: 4084: 4062: 4061: 4037: 4036: 4030: 4029: 4017: 4015: 4004: 4002: 4001: 3985: 3951:closed manifolds 3923: 3919: 3899: 3887: 3874: 3854: 3852: 3851: 3846: 3834: 3832: 3831: 3826: 3814: 3812: 3811: 3806: 3769: 3760:Richard Hamilton 3749: 3737: 3721: 3715: 3704: 3700: 3696: 3689: 3685: 3664: 3660: 3656: 3652: 3636: 3624: 3600: 3596: 3575: 3561: 3559: 3543: 3537: 3521: 3519: 3504: 3496: 3472: 3468: 3462: 3456: 3445: 3438:on the interval 3437: 3426: 3422: 3418: 3414: 3404: 3392: 3384: 3359: 3333: 3331: 3330: 3325: 3311: 3309: 3301: 3293: 3281: 3263: 3239: 3235: 3215: 3200: 3196: 3192: 3173: 3161: 3158:assigns to each 3157: 3141: 3129: 3091:KĂ€hler manifolds 3077: 3058: 3054: 3027: 3023: 3017: 3013: 2998: 2994: 2972: 2954: 2946: 2942: 2912: 2893: 2870: 2866: 2846: 2842: 2835: 2814:totally geodesic 2807: 2798: 2786: 2765:Banach manifolds 2754: 2744:There is also a 2734: 2732: 2731: 2726: 2724: 2723: 2710: 2706: 2696: 2695: 2686: 2685: 2674: 2673: 2666: 2664: 2653: 2643: 2642: 2627: 2626: 2610: 2609: 2594: 2593: 2582: 2581: 2574: 2572: 2561: 2559: 2558: 2528: 2503: 2492: 2488: 2453: 2449: 2445: 2432: 2413: 2409: 2391: 2379: 2375: 2371: 2359: 2357: 2356: 2351: 2349: 2348: 2323: 2322: 2288: 2283:Dirichlet energy 2281:is compact, the 2280: 2277:is oriented and 2276: 2272: 2268: 2257: 2253: 2249: 2243: 2241: 2240: 2237: 2234: 2226: 2206: 2202: 2195: 2193: 2192: 2187: 2173: 2172: 2157: 2155: 2154: 2153: 2140: 2139: 2138: 2125: 2123: 2121: 2120: 2119: 2106: 2105: 2104: 2091: 2089: 2088: 2075: 2070: 2054: 2049: 2033: 2028: 2012: 2007: 1992: 1984: 1972: 1968: 1952: 1938: 1927: 1906: 1904: 1903: 1898: 1893: 1892: 1880: 1879: 1867: 1866: 1861: 1860: 1838: 1837: 1830: 1825: 1807: 1806: 1778: 1759: 1755: 1752:assigns to each 1751: 1747: 1743: 1734: 1730: 1722: 1715: 1711: 1685: 1669: 1665: 1661: 1657: 1634: 1623: 1619: 1607: 1591: 1570: 1559: 1555: 1551: 1547: 1524: 1515: 1511: 1507: 1499: 1487: 1472:Bundle formalism 1467: 1465: 1464: 1459: 1453: 1448: 1424: 1423: 1410: 1405: 1389: 1384: 1366: 1365: 1337: 1333: 1325: 1321: 1314: 1312: 1311: 1306: 1294: 1289: 1268: 1266: 1265: 1264: 1251: 1250: 1249: 1236: 1234: 1232: 1231: 1230: 1217: 1216: 1215: 1202: 1199: 1194: 1178: 1173: 1155: 1153: 1152: 1151: 1138: 1137: 1136: 1123: 1120: 1115: 1093: 1088: 1070: 1068: 1067: 1066: 1054: 1053: 1040: 1039: 1038: 1029: 1028: 1018: 1012: 1007: 973: 969: 956: 952: 948: 944: 940: 936: 932: 928: 921: 919: 918: 913: 911: 907: 906: 900: 898: 897: 896: 883: 882: 881: 865: 860: 858: 857: 856: 843: 842: 841: 825: 820: 818: 817: 816: 803: 802: 801: 785: 783: 782: 776: 775: 762: 757: 742: 734: 724: 719: 694: 693: 687: 685: 684: 683: 670: 669: 668: 652: 647: 645: 644: 643: 630: 629: 628: 612: 607: 605: 604: 603: 590: 589: 588: 572: 570: 569: 563: 562: 549: 544: 529: 521: 511: 506: 471: 453: 432: 428: 414: 410: 392:inverse matrices 389: 379: 375: 371: 367: 356: 352: 348: 333: 323: 319: 315: 311: 300: 296: 292: 288: 284: 279: 270: 170:Richard Hamilton 147: 143: 139: 135: 131: 127: 107:Dirichlet energy 78: 71: 67: 64: 58: 53:this article by 44:inline citations 31: 30: 23: 7395: 7394: 7390: 7389: 7388: 7386: 7385: 7384: 7360: 7359: 7341: 7336: 7314: 7288:Yau, Shing-Tung 7284:Yau, Shing Tung 7260: 7210: 7168: 7118: 7068: 7026: 6970: 6952:Springer-Verlag 6916: 6783: 6733: 6683: 6665:Springer-Verlag 6646: 6600:Struwe, Michael 6550:Struwe, Michael 6518:10.2307/1971321 6450:Yau, Shing Tung 6446:Schoen, Richard 6394:Schoen, Richard 6379:(Erratum:  6378: 6330:Schoen, Richard 6328: 6297:10.2307/1971131 6174:Hartman, Philip 6120:Schoen, Richard 6116:Gromov, Mikhail 6084:10.2307/2373037 5983:10.2307/2946567 5918:Struwe, Michael 5916:Chen, Yun Mei; 5861: 5853: 5849: 5841: 5837: 5829: 5825: 5817: 5813: 5805: 5801: 5777: 5773: 5753:, Lemma 10.11; 5749: 5745: 5729: 5725: 5717: 5713: 5705: 5701: 5693: 5689: 5681: 5677: 5665: 5661: 5626: 5622: 5577: 5573: 5565: 5561: 5553: 5549: 5544: 5540: 5524: 5520: 5504: 5500: 5492: 5488: 5464: 5460: 5424: 5420: 5392: 5388: 5372: 5368: 5336: 5332: 5316: 5312: 5296: 5292: 5284: 5280: 5264: 5260: 5232: 5228: 5208: 5204: 5184: 5180: 5168: 5164: 5156: 5152: 5144: 5135: 5126: 5114: 5100:is a family of 5097: 5092: 5091: 5090: 5058: 5053: 5024: 5020: 5014: 5010: 5009: 4993: 4988: 4941: 4937: 4931: 4927: 4926: 4924: 4897: 4893: 4891: 4888: 4887: 4866: 4863: 4836: 4833: 4832: 4792: 4789: 4788: 4760: 4757: 4756: 4707: 4686: 4662: 4658: 4646: 4634: 4622: 4605: 4601: 4589: 4577: 4568: 4564: 4557: 4553: 4549: 4541: 4537: 4533: 4529: 4525: 4513: 4501: 4489: 4480: 4468: 4457: 4446: 4442: 4430: 4426: 4418: 4415:Ricci curvature 4391: 4390: 4384: 4380: 4374: 4370: 4364: 4363: 4354: 4350: 4341: 4335: 4334: 4333: 4324: 4320: 4311: 4307: 4301: 4300: 4291: 4285: 4284: 4283: 4262: 4261: 4240: 4236: 4234: 4231: 4230: 4223: 4209: 4186: 4185: 4179: 4175: 4169: 4165: 4159: 4158: 4149: 4145: 4136: 4130: 4129: 4128: 4119: 4115: 4106: 4102: 4096: 4095: 4086: 4080: 4079: 4078: 4057: 4056: 4032: 4031: 4025: 4021: 4008: 4003: 3997: 3996: 3994: 3991: 3990: 3976: : 0 < 3975: 3966: 3963:Bochner formula 3959: 3947:Euclidean space 3921: 3909: 3889: 3877: 3864: 3861: 3840: 3837: 3836: 3820: 3817: 3816: 3794: 3791: 3790: 3767: 3739: 3727: 3717: 3714: 3706: 3702: 3698: 3691: 3687: 3676: : 0 < 3675: 3666: 3662: 3658: 3654: 3642: 3626: 3614: 3607: 3598: 3587: : 0 < 3586: 3577: 3571: 3555: 3545: 3542: 3533: 3531: 3523: 3515: 3510: : 0 < 3509: 3500: 3498: 3487: : 0 < 3486: 3477: 3476:Uniqueness. If 3473:decreases to 0. 3470: 3464: 3458: 3455: 3447: 3439: 3436: 3428: 3424: 3420: 3416: 3410: 3394: 3390: 3378: 3361: 3342: 3302: 3294: 3292: 3290: 3287: 3286: 3280: 3274: 3265: 3259: 3253: 3241: 3237: 3229: 3217: 3202: 3198: 3194: 3183: 3175: 3163: 3159: 3147: 3146:on an interval 3131: 3119: 3116: 3111: 3087:holomorphic map 3075: 3060: 3056: 3052: 3034: 3025: 3019: 3015: 3011: 3010:Recall that if 2996: 2984: 2974: 2959: 2952: 2944: 2918: 2900: 2875: 2868: 2848: 2844: 2840: 2817: 2806: 2800: 2788: 2776: 2773: 2761:global analysis 2752: 2719: 2715: 2691: 2687: 2675: 2669: 2668: 2667: 2657: 2652: 2651: 2647: 2638: 2634: 2622: 2618: 2605: 2601: 2583: 2577: 2576: 2575: 2565: 2560: 2554: 2550: 2548: 2545: 2544: 2522: 2505: 2494: 2490: 2487: 2473: 2463: 2455: 2451: 2447: 2440: 2434: 2423: 2415: 2411: 2410:as the mapping 2400: 2389: 2377: 2373: 2370: 2364: 2344: 2340: 2318: 2314: 2297: 2294: 2293: 2286: 2278: 2274: 2270: 2259: 2255: 2251: 2238: 2235: 2232: 2231: 2229: 2228: 2212: 2204: 2200: 2165: 2161: 2149: 2145: 2141: 2134: 2130: 2126: 2124: 2115: 2111: 2107: 2100: 2096: 2092: 2090: 2081: 2077: 2071: 2060: 2050: 2039: 2029: 2018: 2008: 1997: 1983: 1981: 1978: 1977: 1970: 1966: 1959: 1948: 1940: 1937: 1929: 1926: 1917: 1911: 1888: 1884: 1875: 1871: 1862: 1856: 1855: 1854: 1833: 1832: 1826: 1815: 1802: 1798: 1787: 1784: 1783: 1774: 1761: 1757: 1753: 1749: 1745: 1736: 1732: 1728: 1727:the hessian of 1720: 1713: 1708: 1700: 1692: 1687: 1684: 1674: 1667: 1663: 1659: 1636: 1628: 1621: 1617: 1593: 1588: 1580: 1575: 1569: 1561: 1557: 1553: 1549: 1533: 1520: 1513: 1509: 1505: 1489: 1477: 1474: 1449: 1441: 1416: 1412: 1406: 1395: 1385: 1374: 1361: 1357: 1346: 1343: 1342: 1335: 1327: 1323: 1319: 1290: 1282: 1260: 1256: 1252: 1245: 1241: 1237: 1235: 1226: 1222: 1218: 1211: 1207: 1203: 1201: 1195: 1184: 1174: 1163: 1147: 1143: 1139: 1132: 1128: 1124: 1122: 1116: 1108: 1089: 1078: 1062: 1058: 1049: 1045: 1041: 1034: 1030: 1024: 1020: 1019: 1017: 1008: 1000: 982: 979: 978: 971: 968: 958: 954: 950: 946: 942: 938: 934: 930: 926: 909: 908: 902: 901: 892: 888: 884: 874: 870: 866: 864: 852: 848: 844: 834: 830: 826: 824: 812: 808: 804: 794: 790: 786: 784: 778: 777: 768: 764: 758: 747: 733: 726: 720: 712: 696: 695: 689: 688: 679: 675: 671: 661: 657: 653: 651: 639: 635: 631: 621: 617: 613: 611: 599: 595: 591: 581: 577: 573: 571: 565: 564: 555: 551: 545: 534: 520: 513: 507: 499: 482: 480: 477: 476: 465: 455: 447: 437: 430: 416: 412: 398: 381: 377: 373: 369: 366: 358: 354: 350: 346: 325: 321: 317: 313: 310: 302: 298: 294: 290: 286: 282: 277: 268: 265: 221: 193:Simon Donaldson 189:Karen Uhlenbeck 145: 141: 137: 133: 129: 125: 79: 68: 62: 59: 49:Please help to 48: 32: 28: 21: 12: 11: 5: 7393: 7383: 7382: 7377: 7372: 7358: 7357: 7352: 7347: 7340: 7339:External links 7337: 7335: 7334: 7312: 7280: 7258: 7230: 7208: 7188: 7166: 7138: 7116: 7100:Springer, Cham 7088: 7066: 7038: 7024: 6990: 6968: 6936: 6914: 6890: 6889: 6888: 6862:(5): 385–524. 6846: 6781: 6753: 6731: 6703: 6681: 6657:Aubin, Thierry 6652: 6645: 6644: 6616:(3): 485–502. 6596: 6562:(4): 558–581. 6546: 6496: 6462:(3): 333–341. 6442: 6414:(2): 253–268. 6390: 6350:(2): 307–335. 6325: 6274: 6240:(2): 173–204. 6226: 6170: 6112: 6078:(1): 109–160. 6066:Sampson, J. H. 6058: 6014:Ding, Weiyue; 6011: 5977:(1): 165–182. 5964: 5913: 5885:(2): 507–515. 5867: 5860: 5859: 5847: 5835: 5823: 5811: 5799: 5785:, Section 3C; 5771: 5757:, Section 3C; 5743: 5741:, Lemma 5.3.3. 5733:, Section 8A; 5723: 5711: 5699: 5687: 5675: 5673:, Section 6.3. 5659: 5640:(1): 389–415. 5620: 5591:(3): 443–458. 5571: 5559: 5547: 5538: 5518: 5498: 5486: 5480:, Section 2B; 5458: 5440:, Section 1A; 5418: 5408:, Section 1A; 5386: 5366: 5330: 5310: 5304:, Section 3B; 5290: 5278: 5258: 5248:, Section 2B; 5226: 5202: 5178: 5162: 5150: 5148:, Section 11A. 5132: 5125: 5122: 5121: 5120: 5118:Geometric flow 5113: 5110: 5093: 5087: 5086: 5072: 5069: 5066: 5061: 5056: 5052: 5048: 5044: 5041: 5038: 5035: 5032: 5027: 5023: 5017: 5013: 5007: 5004: 5001: 4996: 4991: 4987: 4983: 4979: 4976: 4973: 4970: 4967: 4964: 4961: 4958: 4955: 4952: 4949: 4944: 4940: 4934: 4930: 4923: 4920: 4917: 4914: 4911: 4908: 4905: 4900: 4896: 4862: 4859: 4846: 4843: 4840: 4820: 4817: 4814: 4811: 4808: 4805: 4802: 4799: 4796: 4776: 4773: 4770: 4767: 4764: 4753: 4752: 4749: 4740:is known as a 4722: 4719:twistor theory 4715: 4706: 4703: 4683:Mikhael Gromov 4573: 4572: 4567:is closed and 4561: 4477:Shing-Tung Yau 4473:Richard Schoen 4411: 4410: 4399: 4394: 4387: 4383: 4377: 4373: 4367: 4362: 4357: 4353: 4349: 4344: 4338: 4332: 4327: 4323: 4319: 4314: 4310: 4304: 4299: 4294: 4288: 4282: 4279: 4276: 4273: 4270: 4265: 4260: 4257: 4254: 4251: 4248: 4243: 4239: 4206: 4205: 4194: 4189: 4182: 4178: 4172: 4168: 4162: 4157: 4152: 4148: 4144: 4139: 4133: 4127: 4122: 4118: 4114: 4109: 4105: 4099: 4094: 4089: 4083: 4077: 4074: 4071: 4068: 4065: 4060: 4055: 4052: 4049: 4046: 4043: 4040: 4035: 4028: 4024: 4020: 4014: 4011: 4007: 4000: 3971: 3958: 3955: 3926:weak solutions 3906:Michael Struwe 3860: 3857: 3844: 3824: 3804: 3801: 3798: 3787: 3786: 3783: 3775:Philip Hartman 3710: 3671: 3606: 3603: 3582: 3564: 3563: 3538: 3527: 3505: 3482: 3474: 3451: 3432: 3387: 3386: 3374: 3335: 3334: 3323: 3320: 3317: 3314: 3308: 3305: 3300: 3297: 3276: 3270: 3249: 3245: 3225: 3179: 3115: 3114:Well-posedness 3112: 3110: 3107: 3106: 3105: 3094: 3083: 3073: 3050: 3030: 3029: 3007: 3006: 3005: 3004: 2982: 2897: 2896: 2895: 2872: 2804: 2772: 2769: 2749: 2748: 2741: 2740: 2737: 2736: 2735: 2722: 2718: 2714: 2709: 2705: 2702: 2699: 2694: 2690: 2684: 2681: 2678: 2672: 2663: 2660: 2656: 2650: 2646: 2641: 2637: 2633: 2630: 2625: 2621: 2617: 2613: 2608: 2604: 2600: 2597: 2592: 2589: 2586: 2580: 2571: 2568: 2564: 2557: 2553: 2539: 2538: 2518: 2479: 2465: 2459: 2438: 2419: 2366: 2361: 2360: 2347: 2343: 2339: 2335: 2332: 2329: 2326: 2321: 2317: 2313: 2310: 2307: 2304: 2301: 2289:is defined as 2197: 2196: 2185: 2182: 2179: 2176: 2171: 2168: 2164: 2160: 2152: 2148: 2144: 2137: 2133: 2129: 2118: 2114: 2110: 2103: 2099: 2095: 2087: 2084: 2080: 2074: 2069: 2066: 2063: 2059: 2053: 2048: 2045: 2042: 2038: 2032: 2027: 2024: 2021: 2017: 2011: 2006: 2003: 2000: 1996: 1990: 1987: 1963:energy density 1958: 1955: 1944: 1933: 1922: 1915: 1908: 1907: 1896: 1891: 1887: 1883: 1878: 1874: 1870: 1865: 1859: 1853: 1850: 1847: 1844: 1841: 1836: 1829: 1824: 1821: 1818: 1814: 1810: 1805: 1801: 1797: 1794: 1791: 1765: 1706: 1698: 1690: 1680: 1586: 1578: 1573:tangent spaces 1565: 1473: 1470: 1469: 1468: 1457: 1452: 1447: 1444: 1440: 1436: 1433: 1430: 1427: 1422: 1419: 1415: 1409: 1404: 1401: 1398: 1394: 1388: 1383: 1380: 1377: 1373: 1369: 1364: 1360: 1356: 1353: 1350: 1322:between 1 and 1316: 1315: 1304: 1301: 1298: 1293: 1288: 1285: 1281: 1277: 1274: 1271: 1263: 1259: 1255: 1248: 1244: 1240: 1229: 1225: 1221: 1214: 1210: 1206: 1198: 1193: 1190: 1187: 1183: 1177: 1172: 1169: 1166: 1162: 1158: 1150: 1146: 1142: 1135: 1131: 1127: 1119: 1114: 1111: 1107: 1103: 1100: 1097: 1092: 1087: 1084: 1081: 1077: 1073: 1065: 1061: 1057: 1052: 1048: 1044: 1037: 1033: 1027: 1023: 1016: 1011: 1006: 1003: 999: 995: 992: 989: 986: 964: 953:between 1 and 945:between 1 and 923: 922: 905: 895: 891: 887: 880: 877: 873: 869: 863: 855: 851: 847: 840: 837: 833: 829: 823: 815: 811: 807: 800: 797: 793: 789: 781: 774: 771: 767: 761: 756: 753: 750: 746: 740: 737: 732: 729: 727: 723: 718: 715: 711: 707: 704: 701: 698: 697: 692: 682: 678: 674: 667: 664: 660: 656: 650: 642: 638: 634: 627: 624: 620: 616: 610: 602: 598: 594: 587: 584: 580: 576: 568: 561: 558: 554: 548: 543: 540: 537: 533: 527: 524: 519: 516: 514: 510: 505: 502: 498: 494: 491: 488: 485: 484: 461: 443: 429:between 1 and 411:between 1 and 362: 353:between 1 and 306: 297:between 1 and 264: 261: 233:linear algebra 220: 217: 213:Richard Schoen 197:Mikhael Gromov 162:Joseph Sampson 81: 80: 35: 33: 26: 9: 6: 4: 3: 2: 7392: 7381: 7378: 7376: 7373: 7371: 7368: 7367: 7365: 7356: 7353: 7351: 7348: 7346: 7343: 7342: 7331: 7327: 7323: 7319: 7315: 7313:9781400881918 7309: 7305: 7301: 7297: 7293: 7289: 7285: 7281: 7277: 7273: 7269: 7265: 7261: 7259:3-7643-5397-X 7255: 7251: 7247: 7243: 7239: 7235: 7231: 7227: 7223: 7219: 7215: 7211: 7209:1-57146-002-0 7205: 7201: 7197: 7193: 7189: 7185: 7181: 7177: 7173: 7169: 7163: 7159: 7155: 7151: 7147: 7143: 7139: 7135: 7131: 7127: 7123: 7119: 7113: 7109: 7105: 7101: 7097: 7093: 7089: 7085: 7081: 7077: 7073: 7069: 7067:3-7643-5736-3 7063: 7059: 7055: 7051: 7047: 7043: 7039: 7035: 7031: 7027: 7025:0-521-81160-0 7021: 7017: 7013: 7009: 7005: 7001: 7000: 6995: 6991: 6987: 6983: 6979: 6975: 6971: 6965: 6961: 6957: 6953: 6949: 6945: 6941: 6937: 6933: 6929: 6925: 6921: 6917: 6911: 6907: 6903: 6899: 6895: 6891: 6885: 6881: 6877: 6873: 6869: 6865: 6861: 6857: 6856: 6851: 6847: 6843: 6839: 6835: 6831: 6827: 6823: 6819: 6815: 6814: 6809: 6805: 6804: 6800: 6796: 6792: 6788: 6784: 6782:981-02-1466-9 6778: 6774: 6770: 6766: 6762: 6758: 6754: 6750: 6746: 6742: 6738: 6734: 6732:0-8218-0700-5 6728: 6724: 6720: 6716: 6712: 6708: 6704: 6700: 6696: 6692: 6688: 6684: 6682:3-540-60752-8 6678: 6674: 6670: 6666: 6662: 6658: 6654: 6653: 6651: 6650: 6641: 6637: 6633: 6629: 6624: 6619: 6615: 6611: 6610: 6605: 6601: 6597: 6593: 6589: 6585: 6581: 6577: 6573: 6569: 6565: 6561: 6557: 6556: 6551: 6547: 6543: 6539: 6535: 6531: 6527: 6523: 6519: 6515: 6512:(1): 73–111. 6511: 6507: 6506: 6501: 6500:Siu, Yum Tong 6497: 6493: 6489: 6485: 6481: 6477: 6473: 6469: 6465: 6461: 6457: 6456: 6451: 6447: 6443: 6439: 6435: 6431: 6427: 6422: 6417: 6413: 6409: 6408: 6403: 6399: 6395: 6391: 6386: 6382: 6375: 6371: 6367: 6363: 6358: 6353: 6349: 6345: 6344: 6339: 6335: 6331: 6326: 6322: 6318: 6314: 6310: 6306: 6302: 6298: 6294: 6290: 6286: 6285: 6280: 6279:Uhlenbeck, K. 6275: 6271: 6267: 6263: 6259: 6255: 6251: 6247: 6243: 6239: 6235: 6231: 6227: 6223: 6219: 6215: 6211: 6207: 6203: 6198: 6193: 6189: 6185: 6184: 6179: 6175: 6171: 6167: 6163: 6159: 6155: 6151: 6147: 6143: 6139: 6135: 6131: 6130: 6125: 6121: 6117: 6113: 6109: 6105: 6101: 6097: 6093: 6089: 6085: 6081: 6077: 6073: 6072: 6067: 6063: 6059: 6055: 6051: 6047: 6043: 6038: 6033: 6029: 6025: 6021: 6017: 6012: 6008: 6004: 6000: 5996: 5992: 5988: 5984: 5980: 5976: 5972: 5971: 5965: 5961: 5957: 5953: 5949: 5945: 5941: 5937: 5933: 5930:(1): 83–103. 5929: 5925: 5924: 5919: 5914: 5910: 5906: 5902: 5898: 5893: 5888: 5884: 5880: 5879: 5874: 5869: 5868: 5866: 5865: 5856: 5851: 5844: 5839: 5832: 5831:Corlette 1992 5827: 5820: 5815: 5808: 5803: 5796: 5792: 5788: 5784: 5780: 5775: 5768: 5764: 5760: 5756: 5752: 5747: 5740: 5737:, p.128-130; 5736: 5735:Hamilton 1975 5732: 5727: 5720: 5715: 5708: 5703: 5696: 5691: 5684: 5679: 5672: 5668: 5663: 5655: 5651: 5647: 5643: 5639: 5635: 5631: 5624: 5616: 5612: 5608: 5604: 5599: 5594: 5590: 5586: 5582: 5575: 5568: 5563: 5556: 5555:Hamilton 1975 5551: 5542: 5535: 5531: 5527: 5522: 5515: 5511: 5507: 5502: 5495: 5494:Hamilton 1975 5490: 5483: 5479: 5475: 5471: 5467: 5462: 5455: 5451: 5447: 5443: 5439: 5435: 5431: 5427: 5422: 5415: 5412:, p.490-491; 5411: 5407: 5403: 5399: 5395: 5390: 5383: 5379: 5375: 5370: 5363: 5359: 5355: 5351: 5347: 5343: 5339: 5334: 5327: 5323: 5322:Hamilton 1975 5319: 5314: 5307: 5306:Hamilton 1975 5303: 5299: 5294: 5287: 5282: 5275: 5274:Hamilton 1975 5271: 5267: 5262: 5255: 5251: 5250:Hamilton 1975 5247: 5243: 5239: 5235: 5230: 5223: 5222:Hamilton 1975 5219: 5215: 5211: 5206: 5199: 5195: 5191: 5187: 5182: 5175: 5171: 5166: 5159: 5154: 5147: 5142: 5140: 5138: 5133: 5131: 5130: 5119: 5116: 5115: 5109: 5107: 5103: 5096: 5067: 5059: 5054: 5050: 5046: 5039: 5036: 5033: 5025: 5021: 5015: 5011: 5002: 4994: 4989: 4985: 4981: 4971: 4965: 4962: 4956: 4950: 4942: 4938: 4932: 4928: 4921: 4915: 4906: 4898: 4894: 4886: 4885: 4884: 4882: 4881:metric spaces 4877: 4873: 4869: 4858: 4844: 4841: 4838: 4818: 4809: 4806: 4803: 4797: 4794: 4774: 4768: 4765: 4762: 4750: 4747: 4743: 4739: 4735: 4731: 4727: 4723: 4720: 4716: 4713: 4709: 4708: 4702: 4700: 4694: 4690: 4684: 4680: 4676: 4671: 4669: 4654: 4650: 4642: 4638: 4630: 4626: 4619: 4615: 4609: 4597: 4593: 4585: 4581: 4562: 4547: 4546: 4545: 4521: 4517: 4509: 4505: 4497: 4495: 4492: 4486: 4478: 4474: 4464: 4460: 4453: 4449: 4438: 4434: 4424: 4416: 4397: 4385: 4381: 4375: 4371: 4360: 4355: 4351: 4347: 4342: 4330: 4325: 4321: 4317: 4312: 4308: 4297: 4292: 4277: 4274: 4258: 4252: 4246: 4241: 4229: 4228: 4227: 4220: 4216: 4212: 4192: 4180: 4176: 4170: 4166: 4155: 4150: 4146: 4142: 4137: 4125: 4120: 4116: 4112: 4107: 4103: 4092: 4087: 4072: 4069: 4053: 4050: 4044: 4038: 4026: 4018: 4012: 3989: 3988: 3987: 3983: 3979: 3974: 3970: 3964: 3954: 3952: 3948: 3943: 3940: 3936: 3932: 3927: 3917: 3913: 3907: 3902: 3897: 3893: 3885: 3881: 3872: 3868: 3856: 3842: 3822: 3802: 3799: 3796: 3784: 3781: 3780: 3779: 3776: 3771: 3765: 3761: 3756: 3753: 3747: 3743: 3735: 3731: 3723: 3720: 3713: 3709: 3701:increases to 3694: 3683: 3679: 3674: 3670: 3650: 3646: 3640: 3634: 3630: 3622: 3618: 3610: 3602: 3594: 3590: 3585: 3581: 3574: 3569: 3558: 3553: 3549: 3541: 3536: 3530: 3526: 3518: 3513: 3508: 3503: 3494: 3490: 3485: 3481: 3475: 3467: 3461: 3457:converges to 3454: 3450: 3443: 3435: 3431: 3413: 3408: 3407: 3406: 3402: 3398: 3382: 3377: 3373: 3369: 3365: 3358: 3354: 3350: 3346: 3340: 3339: 3338: 3321: 3318: 3312: 3306: 3298: 3285: 3284: 3283: 3279: 3273: 3269: 3262: 3257: 3252: 3248: 3244: 3233: 3228: 3224: 3220: 3214: 3210: 3206: 3191: 3187: 3182: 3178: 3171: 3167: 3155: 3151: 3145: 3139: 3135: 3127: 3123: 3103: 3099: 3095: 3092: 3088: 3084: 3081: 3072: 3068: 3064: 3049: 3045: 3041: 3037: 3033:A smooth map 3032: 3031: 3022: 3009: 3008: 3002: 2992: 2988: 2981: 2977: 2970: 2966: 2963: : ℝ → ( 2962: 2957: 2956: 2950: 2940: 2936: 2932: 2929: 2925: 2921: 2916: 2911: 2907: 2903: 2898: 2891: 2887: 2883: 2879: 2873: 2864: 2860: 2856: 2852: 2838: 2837: 2833: 2829: 2825: 2821: 2815: 2811: 2810: 2809: 2803: 2796: 2792: 2784: 2780: 2768: 2766: 2762: 2758: 2747: 2743: 2742: 2738: 2720: 2716: 2712: 2707: 2703: 2697: 2692: 2688: 2682: 2679: 2676: 2661: 2648: 2644: 2639: 2635: 2631: 2628: 2623: 2619: 2615: 2606: 2602: 2595: 2590: 2587: 2584: 2569: 2555: 2551: 2543: 2542: 2541: 2540: 2536: 2532: 2531: 2530: 2526: 2521: 2517: 2513: 2509: 2502: 2498: 2486: 2482: 2477: 2472: 2468: 2462: 2458: 2444: 2437: 2431: 2427: 2422: 2418: 2407: 2403: 2398: 2393: 2387: 2383: 2369: 2345: 2341: 2337: 2330: 2324: 2319: 2315: 2311: 2305: 2299: 2292: 2291: 2290: 2284: 2266: 2262: 2247: 2225: 2222: 2218: 2215: 2210: 2209:bundle metric 2183: 2177: 2174: 2169: 2166: 2162: 2150: 2146: 2135: 2131: 2116: 2112: 2101: 2097: 2085: 2082: 2078: 2072: 2067: 2064: 2061: 2057: 2051: 2046: 2043: 2040: 2036: 2030: 2025: 2022: 2019: 2015: 2009: 2004: 2001: 1998: 1994: 1988: 1985: 1976: 1975: 1974: 1965:of a mapping 1964: 1954: 1951: 1947: 1943: 1936: 1932: 1925: 1921: 1914: 1889: 1885: 1881: 1876: 1872: 1863: 1848: 1845: 1827: 1822: 1819: 1816: 1812: 1808: 1803: 1795: 1782: 1781: 1780: 1777: 1772: 1768: 1764: 1742: 1739: 1726: 1717: 1710: 1702: 1694: 1683: 1678: 1673: 1656: 1653: 1649: 1646: 1642: 1639: 1632: 1627: 1615: 1611: 1606: 1603: 1599: 1596: 1590: 1582: 1574: 1568: 1564: 1546: 1543: 1539: 1536: 1532: 1531:vector bundle 1528: 1523: 1519: 1503: 1497: 1493: 1485: 1481: 1455: 1450: 1445: 1442: 1434: 1431: 1420: 1417: 1413: 1407: 1402: 1399: 1396: 1392: 1386: 1381: 1378: 1375: 1371: 1367: 1362: 1354: 1341: 1340: 1339: 1331: 1302: 1299: 1296: 1291: 1286: 1283: 1275: 1261: 1257: 1246: 1242: 1227: 1223: 1212: 1208: 1196: 1191: 1188: 1185: 1181: 1175: 1170: 1167: 1164: 1160: 1156: 1148: 1144: 1133: 1129: 1117: 1112: 1109: 1101: 1090: 1085: 1082: 1079: 1075: 1071: 1063: 1059: 1050: 1046: 1035: 1031: 1025: 1014: 1009: 1004: 1001: 993: 990: 977: 976: 975: 967: 962: 949:and for each 893: 889: 878: 875: 871: 861: 853: 849: 838: 835: 831: 821: 813: 809: 798: 795: 791: 772: 769: 765: 759: 754: 751: 748: 744: 738: 735: 730: 728: 721: 716: 713: 705: 680: 676: 665: 662: 658: 648: 640: 636: 625: 622: 618: 608: 600: 596: 585: 582: 578: 559: 556: 552: 546: 541: 538: 535: 531: 525: 522: 517: 515: 508: 503: 500: 492: 475: 474: 473: 469: 464: 459: 451: 446: 441: 436: 427: 423: 419: 409: 405: 401: 395: 393: 388: 384: 365: 361: 344: 340: 336: 332: 328: 309: 305: 280: 274: 260: 258: 254: 250: 249:tension field 247:(also called 246: 242: 238: 234: 230: 226: 216: 214: 210: 206: 202: 198: 194: 190: 185: 183: 179: 175: 171: 167: 163: 159: 154: 151: 122: 120: 116: 112: 108: 104: 100: 96: 92: 88: 77: 74: 66: 56: 52: 46: 45: 39: 34: 25: 24: 19: 7291: 7237: 7199: 7145: 7142:Lin, Fanghua 7095: 7092:Jost, JĂŒrgen 7045: 7042:Jost, JĂŒrgen 6998: 6943: 6897: 6859: 6853: 6817: 6811: 6760: 6757:Eells, James 6710: 6707:Eells, James 6660: 6648: 6647: 6613: 6607: 6559: 6553: 6509: 6503: 6459: 6453: 6411: 6405: 6347: 6341: 6288: 6282: 6237: 6233: 6230:Jost, JĂŒrgen 6187: 6181: 6133: 6127: 6075: 6069: 6027: 6023: 5974: 5968: 5927: 5921: 5882: 5876: 5863: 5862: 5850: 5838: 5826: 5814: 5809:, p.336-337. 5802: 5774: 5746: 5726: 5714: 5702: 5690: 5678: 5662: 5637: 5633: 5623: 5588: 5584: 5574: 5569:, Theorem B. 5567:Hartman 1967 5562: 5557:, p.157-161. 5550: 5541: 5521: 5501: 5489: 5461: 5421: 5389: 5384:, p.490-491. 5369: 5333: 5313: 5293: 5281: 5261: 5229: 5205: 5181: 5165: 5153: 5128: 5127: 5105: 5094: 5088: 4879:between two 4875: 4871: 4867: 4864: 4754: 4699:metric space 4692: 4688: 4672: 4652: 4648: 4640: 4636: 4628: 4624: 4614:Yum-Tong Siu 4610: 4595: 4591: 4583: 4579: 4575: 4519: 4515: 4507: 4503: 4499: 4490: 4462: 4458: 4451: 4447: 4436: 4432: 4412: 4218: 4214: 4210: 4207: 3981: 3977: 3972: 3968: 3960: 3944: 3938: 3930: 3915: 3911: 3903: 3895: 3891: 3883: 3879: 3870: 3866: 3862: 3788: 3772: 3757: 3745: 3741: 3733: 3729: 3725: 3718: 3711: 3707: 3692: 3681: 3677: 3672: 3668: 3648: 3644: 3632: 3628: 3620: 3616: 3612: 3608: 3592: 3588: 3583: 3579: 3572: 3567: 3565: 3556: 3551: 3547: 3539: 3534: 3528: 3524: 3516: 3511: 3506: 3501: 3492: 3488: 3483: 3479: 3469:topology as 3465: 3459: 3452: 3448: 3441: 3433: 3429: 3411: 3400: 3396: 3388: 3380: 3375: 3371: 3367: 3363: 3356: 3352: 3348: 3344: 3336: 3277: 3271: 3267: 3260: 3255: 3250: 3246: 3242: 3231: 3226: 3222: 3218: 3212: 3208: 3204: 3189: 3185: 3180: 3176: 3169: 3165: 3153: 3149: 3143: 3137: 3133: 3125: 3121: 3117: 3104:is harmonic. 3093:is harmonic. 3070: 3066: 3062: 3047: 3043: 3039: 3035: 3020: 2990: 2986: 2979: 2978: : (ℝ, 2975: 2968: 2964: 2960: 2951:relative to 2938: 2934: 2930: 2927: 2923: 2919: 2909: 2905: 2901: 2894:is harmonic. 2889: 2885: 2881: 2877: 2871:is harmonic. 2862: 2858: 2854: 2850: 2831: 2827: 2823: 2819: 2801: 2794: 2790: 2782: 2778: 2774: 2750: 2745: 2534: 2524: 2519: 2515: 2511: 2507: 2500: 2496: 2484: 2480: 2475: 2470: 2466: 2460: 2456: 2442: 2435: 2429: 2425: 2420: 2416: 2405: 2401: 2396: 2394: 2367: 2362: 2282: 2264: 2260: 2245: 2223: 2220: 2216: 2213: 2198: 1962: 1960: 1949: 1945: 1941: 1934: 1930: 1923: 1919: 1912: 1909: 1775: 1770: 1766: 1762: 1740: 1737: 1718: 1704: 1696: 1688: 1681: 1676: 1672:bilinear map 1670:, one has a 1654: 1651: 1647: 1644: 1640: 1637: 1630: 1604: 1601: 1597: 1594: 1584: 1576: 1566: 1562: 1544: 1541: 1537: 1534: 1521: 1518:differential 1495: 1491: 1483: 1479: 1475: 1329: 1317: 965: 960: 924: 467: 462: 457: 449: 444: 439: 425: 421: 417: 407: 403: 399: 396: 386: 382: 363: 359: 330: 326: 307: 303: 266: 252: 248: 244: 240: 236: 222: 186: 177: 155: 123: 94: 84: 69: 60: 41: 7234:Simon, Leon 7004:James Eells 6820:(1): 1–68. 6291:(1): 1–24. 6277:Sacks, J.; 6190:: 673–687. 6136:: 165–246. 5707:Struwe 1988 5683:Struwe 1985 5442:HĂ©lein 2002 5350:HĂ©lein 2002 5190:HĂ©lein 2002 4742:sigma model 3705:, the maps 3264:, equal to 2999:solves the 2529:is smooth. 2376:induced by 433:define the 345:. For each 289:. For each 273:open subset 158:James Eells 150:rubber band 63:August 2020 55:introducing 7364:Categories 7330:0478.53001 7276:0864.58015 7226:0886.53004 7196:Yau, S. T. 7192:Schoen, R. 7184:1203.58004 7134:1380.53001 7084:0896.53002 7034:1010.58010 6986:0308.35003 6932:1262.35001 6884:0669.58009 6842:0401.58003 6799:0836.58012 6749:0515.58011 6699:0896.53003 6640:0631.58004 6592:0595.58013 6542:0517.53058 6492:0361.53040 6438:0547.58020 6374:0521.58021 6321:0462.58014 6270:0798.58021 6222:0148.42404 6166:0896.58024 6108:0122.40102 6054:0855.58016 6016:Tian, Gang 6007:0768.53025 5960:0652.58024 5909:0765.53026 5779:Aubin 1998 5751:Aubin 1998 5598:1807.08236 5526:Aubin 1998 5466:Aubin 1998 5426:Aubin 1998 5394:Aubin 1998 5338:Aubin 1998 5234:Aubin 1998 5210:Aubin 1998 5186:Aubin 1998 5124:References 5089:in which ÎŒ 4746:instantons 4679:Lie groups 4487:which are 3446:such that 3201:, the map 2867:valued at 2495:(−Δ, Δ) × 2454:such that 1723:, one may 1610:connection 394:by and . 174:Ricci flow 140:stretches 93:is called 38:references 6850:Eells, J. 6808:Eells, J. 6584:122295509 6484:120845708 6262:122184265 6158:118023776 5855:Jost 1994 5791:Jost 2017 5787:Jost 1997 5763:Jost 2017 5759:Jost 1997 5654:1944-9992 5615:0024-6093 5482:Jost 2017 5448:, p.491; 5446:Jost 2017 5410:Jost 2017 5382:Jost 2017 5356:, p.489; 5354:Jost 2017 5326:Jost 2017 5212:, p.349; 5196:, p.489; 5194:Jost 2017 5129:Footnotes 5060:ϵ 5051:μ 5012:∫ 4995:ϵ 4986:μ 4929:∫ 4899:ϵ 4845:γ 4842:∘ 4816:→ 4795:γ 4772:→ 4712:curvature 4376:∗ 4361:⁡ 4348:− 4326:∗ 4269:∇ 4238:Δ 4171:∗ 4156:⁡ 4121:∗ 4093:− 4064:∇ 4054:− 4023:Δ 4019:− 4010:∂ 4006:∂ 3935:Gang Tian 3800:× 3752:homotopic 3697:, and as 3550:< min( 3544:whenever 3360:given by 3316:Δ 3304:∂ 3296:∂ 3216:given by 3038: : ( 2922: : ( 2915:immersion 2717:μ 2701:Δ 2659:∂ 2655:∂ 2636:∫ 2632:− 2620:μ 2567:∂ 2563:∂ 2552:∫ 2537:says that 2504:given by 2342:μ 2316:∫ 2207:induce a 2175:∘ 2170:β 2167:α 2143:∂ 2136:β 2128:∂ 2109:∂ 2102:α 2094:∂ 2062:β 2058:∑ 2041:α 2037:∑ 2016:∑ 1995:∑ 1973:given by 1840:∇ 1813:∑ 1793:Δ 1451:α 1426:∇ 1393:∑ 1372:∑ 1363:α 1352:Δ 1297:∘ 1292:α 1287:γ 1284:β 1270:Γ 1254:∂ 1247:γ 1239:∂ 1220:∂ 1213:β 1205:∂ 1186:γ 1182:∑ 1165:β 1161:∑ 1141:∂ 1134:α 1126:∂ 1096:Γ 1076:∑ 1072:− 1056:∂ 1043:∂ 1036:α 1022:∂ 1010:α 985:∇ 894:δ 886:∂ 879:β 876:α 868:∂ 862:− 854:β 846:∂ 839:δ 836:α 828:∂ 814:α 806:∂ 799:δ 796:β 788:∂ 773:δ 770:γ 749:δ 745:∑ 722:γ 717:β 714:α 700:Γ 681:ℓ 673:∂ 655:∂ 649:− 633:∂ 626:ℓ 615:∂ 593:∂ 586:ℓ 575:∂ 560:ℓ 536:ℓ 532:∑ 487:Γ 415:and each 397:For each 339:symmetric 245:Laplacian 7236:(1996). 7198:(1997). 7094:(2017). 7044:(1997). 6996:(2002). 6942:(1975). 6659:(1998). 6602:(1988). 6400:(1983). 6336:(1982). 6214:13381249 6176:(1967). 6122:(1992). 6018:(1995). 5952:11210055 5864:Articles 5819:Siu 1980 5532:, p.11; 5512:, p.28; 5508:, p.10; 5496:, p.135. 5476:, p.14; 5472:, p.11; 5436:, p.13; 5432:, p.10; 5404:, p.13; 5400:, p.10; 5380:, p.13; 5376:, p.10; 5348:, p.13; 5344:, p.10; 5328:, p.494. 5272:, p.13; 5244:, p.15; 5220:, p.15; 5112:See also 5102:measures 4874:→ 4870: : 4494:-bounded 4337:⟩ 4303:⟨ 4213: : 4132:⟩ 4098:⟨ 3855:-fiber. 3184: : 3100:between 3089:between 3069:) → (ℝ, 3046:) → (ℝ, 3001:geodesic 2904: : 2839:For any 2757:gradient 2489:for all 2424: : 1571:between 466: : 448: : 281:and let 253:harmonic 166:deformed 95:harmonic 7322:0645729 7290:(ed.). 7268:1399562 7218:1474501 7176:2431658 7126:3726907 7076:1451625 6978:0482822 6924:3099262 6876:0956352 6834:0495450 6791:1363513 6741:0703510 6691:1636569 6632:0965226 6576:0826871 6534:0584075 6526:1971321 6476:0438388 6430:0710054 6366:0664498 6313:0604040 6305:1971131 6254:1385525 6206:0214004 6150:1215595 6100:0164306 6092:2373037 6046:1371209 5999:1147961 5991:2946567 5944:0990191 5901:1180392 5536:, p.14. 5452:, p.1; 5444:, p.7; 5360:, p.1; 5352:, p.7; 5324:, p.4; 5320:, p.9; 5300:, p.8; 5268:, p.8; 5252:, p.4; 5240:, p.9; 5216:, p.9; 5192:, p.6; 5188:, p.6; 4413:If the 3766:, when 3568:maximal 3546:0 < 3463:in the 2949:minimal 2917:, then 2242:⁠ 2230:⁠ 1928:is any 1918:, ..., 1529:of the 1527:section 51:improve 7328:  7320:  7310:  7274:  7266:  7256:  7224:  7216:  7206:  7182:  7174:  7164:  7132:  7124:  7114:  7082:  7074:  7064:  7032:  7022:  6984:  6976:  6966:  6930:  6922:  6912:  6882:  6874:  6840:  6832:  6797:  6789:  6779:  6747:  6739:  6729:  6697:  6689:  6679:  6638:  6630:  6590:  6582:  6574:  6540:  6532:  6524:  6490:  6482:  6474:  6436:  6428:  6372:  6364:  6319:  6311:  6303:  6268:  6260:  6252:  6220:  6212:  6204:  6164:  6156:  6148:  6106:  6098:  6090:  6052:  6044:  6005:  5997:  5989:  5958:  5950:  5942:  5907:  5899:  5652:  5613:  5456:, p.2. 5416:, p.1. 5364:, p.1. 5308:, p.4. 5288:, p.4. 5276:, p.3. 5256:, p.3. 5224:, p.4. 5200:, p.2. 4755:A map 4734:action 4732:whose 3931:bubble 3096:Every 3085:Every 2913:is an 2812:Every 2363:where 1910:where 1719:Using 1608:has a 357:, let 335:matrix 301:, let 271:be an 40:, but 6580:S2CID 6522:JSTOR 6480:S2CID 6301:JSTOR 6258:S2CID 6210:S2CID 6154:S2CID 6088:JSTOR 5987:JSTOR 5948:S2CID 5593:arXiv 3980:< 3815:into 3680:< 3657:from 3591:< 3514:< 3491:< 3415:from 2985:) → ( 2933:) → ( 2884:) → ( 2857:) → ( 2826:) → ( 2433:with 1744:over 1725:trace 1658:over 1548:over 1525:as a 1508:from 929:from 7308:ISBN 7254:ISBN 7204:ISBN 7162:ISBN 7112:ISBN 7062:ISBN 7020:ISBN 6964:ISBN 6910:ISBN 6777:ISBN 6727:ISBN 6677:ISBN 5650:ISSN 5611:ISSN 4728:, a 4661:and 4633:and 4552:and 4512:and 4500:Let 4475:and 4352:scal 4147:scal 3888:and 3738:and 3690:has 3625:and 3613:Let 3497:and 3440:(0, 3370:) ↩ 3351:) × 3211:) → 3130:and 3118:Let 3074:stan 3051:stan 2983:stan 2816:map 2805:stan 2787:and 2775:Let 2763:and 2533:The 2514:) ↩ 2395:The 2203:and 1707:f(p) 1620:and 1587:f(p) 1488:and 1476:Let 941:and 454:and 349:and 341:and 293:and 267:Let 243:The 239:and 207:and 160:and 7326:Zbl 7300:doi 7272:Zbl 7246:doi 7222:Zbl 7180:Zbl 7154:doi 7130:Zbl 7104:doi 7080:Zbl 7054:doi 7030:Zbl 7012:doi 6982:Zbl 6956:doi 6928:Zbl 6902:doi 6880:Zbl 6864:doi 6838:Zbl 6822:doi 6795:Zbl 6769:doi 6745:Zbl 6719:doi 6695:Zbl 6669:doi 6636:Zbl 6618:doi 6588:Zbl 6564:doi 6538:Zbl 6514:doi 6510:112 6488:Zbl 6464:doi 6434:Zbl 6416:doi 6381:doi 6370:Zbl 6352:doi 6317:Zbl 6293:doi 6289:113 6266:Zbl 6242:doi 6218:Zbl 6192:doi 6162:Zbl 6138:doi 6104:Zbl 6080:doi 6050:Zbl 6032:doi 6003:Zbl 5979:doi 5975:135 5956:Zbl 5932:doi 5928:201 5905:Zbl 5887:doi 5642:doi 5603:doi 4724:In 4604:to 4563:If 4548:If 4532:to 4425:of 4417:of 4309:Ric 4104:Ric 3695:= ∞ 3661:to 3641:of 3419:to 3197:in 3162:in 2958:If 2947:is 2899:If 2843:in 2450:of 2285:of 2250:on 2211:on 1756:in 1675:(∇( 1666:in 1616:on 1556:in 1512:to 1500:be 1338:by 1334:on 974:by 970:on 933:to 472:by 470:→ ℝ 452:→ ℝ 376:in 337:is 320:in 275:of 113:in 7366:: 7324:. 7318:MR 7316:. 7306:. 7270:. 7264:MR 7262:. 7252:. 7244:. 7220:. 7214:MR 7212:. 7194:; 7178:. 7172:MR 7170:. 7160:. 7152:. 7128:. 7122:MR 7120:. 7110:. 7102:. 7078:. 7072:MR 7070:. 7060:. 7052:. 7028:. 7018:. 7010:. 6980:. 6974:MR 6972:. 6962:. 6954:. 6946:. 6926:. 6920:MR 6918:. 6908:. 6878:. 6872:MR 6870:. 6860:20 6858:. 6836:. 6830:MR 6828:. 6818:10 6816:. 6793:. 6787:MR 6785:. 6775:. 6767:. 6743:. 6737:MR 6735:. 6725:. 6717:. 6693:. 6687:MR 6685:. 6675:. 6667:. 6634:. 6628:MR 6626:. 6614:28 6612:. 6606:. 6586:. 6578:. 6572:MR 6570:. 6560:60 6558:. 6536:. 6530:MR 6528:. 6520:. 6486:. 6478:. 6472:MR 6470:. 6460:51 6458:. 6448:; 6432:. 6426:MR 6424:. 6412:18 6410:. 6404:. 6396:; 6368:. 6362:MR 6360:. 6348:17 6346:. 6340:. 6332:; 6315:. 6309:MR 6307:. 6299:. 6264:. 6256:. 6250:MR 6248:. 6236:. 6216:. 6208:. 6202:MR 6200:. 6188:19 6186:. 6180:. 6160:. 6152:. 6146:MR 6144:. 6134:76 6132:. 6126:. 6118:; 6102:. 6096:MR 6094:. 6086:. 6076:86 6074:. 6064:; 6048:. 6042:MR 6040:. 6026:. 6022:. 6001:. 5995:MR 5993:. 5985:. 5954:. 5946:. 5940:MR 5938:. 5926:. 5903:. 5897:MR 5895:. 5883:36 5881:. 5875:. 5669:; 5648:. 5638:12 5636:. 5632:. 5609:. 5601:. 5589:51 5587:. 5583:. 5172:; 5136:^ 5108:. 4721:.) 4691:, 4651:, 4639:, 4627:, 4594:, 4582:, 4518:, 4506:, 4382:Rm 4217:→ 4177:Rm 3982:T 3914:, 3894:, 3882:, 3869:, 3744:, 3732:, 3682:T 3647:, 3631:, 3619:, 3593:T 3554:, 3535:f 3532:= 3502:f 3493:T 3399:, 3366:, 3355:→ 3347:, 3272:t 3266:(∆ 3251:t 3227:t 3221:↩ 3207:, 3188:→ 3168:, 3152:, 3136:, 3124:, 3065:, 3042:, 2989:, 2967:, 2937:, 2926:, 2908:→ 2888:, 2880:, 2861:, 2853:, 2830:, 2822:, 2793:, 2781:, 2767:. 2510:, 2499:→ 2483:− 2474:= 2469:− 2441:= 2428:→ 2365:dÎŒ 2246:df 2244:| 2224:TN 2219:⊗ 1953:. 1741:TN 1716:. 1703:→ 1695:× 1679:)) 1677:df 1655:TN 1650:⊗ 1643:⊗ 1631:df 1629:∇( 1605:TN 1600:⊗ 1583:→ 1563:df 1545:TN 1540:⊗ 1522:df 1494:, 1482:, 1328:(∆ 966:ij 961:df 959:∇( 463:αÎČ 456:Γ( 445:ij 438:Γ( 424:, 420:, 406:, 402:, 385:× 364:αÎČ 329:× 308:ij 259:. 184:. 121:. 7332:. 7302:: 7278:. 7248:: 7228:. 7186:. 7156:: 7136:. 7106:: 7086:. 7056:: 7036:. 7014:: 6988:. 6958:: 6934:. 6904:: 6886:. 6866:: 6844:. 6824:: 6801:. 6771:: 6751:. 6721:: 6701:. 6671:: 6642:. 6620:: 6594:. 6566:: 6544:. 6516:: 6494:. 6466:: 6440:. 6418:: 6387:) 6383:: 6376:. 6354:: 6323:. 6295:: 6272:. 6244:: 6238:2 6224:. 6194:: 6168:. 6140:: 6110:. 6082:: 6056:. 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4431:∆ 4427:h 4419:g 4398:. 4393:) 4386:h 4372:f 4366:( 4356:g 4343:g 4331:h 4322:f 4318:, 4313:g 4298:+ 4293:2 4287:| 4281:) 4278:f 4275:d 4272:( 4264:| 4259:= 4256:) 4253:f 4250:( 4247:e 4242:g 4224:t 4219:N 4215:M 4211:f 4193:. 4188:) 4181:h 4167:f 4161:( 4151:g 4143:+ 4138:g 4126:h 4117:f 4113:, 4108:g 4088:2 4082:| 4076:) 4073:f 4070:d 4067:( 4059:| 4051:= 4048:) 4045:f 4042:( 4039:e 4034:) 4027:g 4013:t 3999:( 3984:} 3978:t 3973:t 3969:f 3967:{ 3922:M 3918:) 3916:h 3912:N 3910:( 3898:) 3896:h 3892:N 3890:( 3886:) 3884:g 3880:M 3878:( 3873:) 3871:h 3867:N 3865:( 3843:M 3823:N 3803:M 3797:W 3768:M 3748:) 3746:h 3742:N 3740:( 3736:) 3734:g 3730:M 3728:( 3719:C 3712:t 3708:f 3703:∞ 3699:t 3693:T 3688:f 3684:} 3678:t 3673:t 3669:f 3667:{ 3663:N 3659:M 3655:f 3651:) 3649:h 3645:N 3643:( 3635:) 3633:h 3629:N 3627:( 3623:) 3621:g 3617:M 3615:( 3599:T 3595:} 3589:t 3584:t 3580:f 3578:{ 3573:f 3562:. 3560:) 3557:T 3552:T 3548:t 3540:t 3529:t 3525:f 3520:} 3517:T 3512:t 3507:t 3499:{ 3495:} 3489:t 3484:t 3480:f 3478:{ 3471:t 3466:C 3460:f 3453:t 3449:f 3444:) 3442:T 3434:t 3430:f 3425:T 3421:N 3417:M 3412:f 3403:) 3401:h 3397:N 3395:( 3391:M 3385:. 3383:) 3381:p 3379:( 3376:t 3372:f 3368:p 3364:t 3362:( 3357:N 3353:M 3349:b 3345:a 3343:( 3322:. 3319:f 3313:= 3307:t 3299:f 3278:p 3275:) 3268:f 3261:N 3258:) 3256:p 3254:( 3247:f 3243:T 3238:t 3234:) 3232:p 3230:( 3223:f 3219:t 3213:N 3209:b 3205:a 3203:( 3199:M 3195:p 3190:N 3186:M 3181:t 3177:f 3172:) 3170:b 3166:a 3164:( 3160:t 3156:) 3154:b 3150:a 3148:( 3140:) 3138:h 3134:N 3132:( 3128:) 3126:g 3122:M 3120:( 3082:. 3076:) 3071:g 3067:g 3063:M 3061:( 3057:n 3053:) 3048:g 3044:g 3040:M 3036:f 3026:f 3021:f 3016:f 3012:M 2997:f 2993:) 2991:h 2987:N 2980:g 2976:f 2971:) 2969:h 2965:N 2961:f 2953:h 2945:f 2941:) 2939:h 2935:N 2931:h 2928:f 2924:M 2920:f 2910:N 2906:M 2902:f 2892:) 2890:g 2886:M 2882:g 2878:M 2876:( 2869:q 2865:) 2863:h 2859:N 2855:g 2851:M 2849:( 2845:N 2841:q 2834:) 2832:h 2828:N 2824:g 2820:M 2818:( 2802:g 2797:) 2795:h 2791:N 2789:( 2785:) 2783:g 2779:M 2777:( 2753:f 2721:g 2713:d 2708:) 2704:f 2698:, 2693:s 2689:f 2683:0 2680:= 2677:s 2671:| 2662:s 2649:( 2645:h 2640:M 2629:= 2624:g 2616:d 2612:) 2607:s 2603:f 2599:( 2596:e 2591:0 2588:= 2585:s 2579:| 2570:s 2556:M 2527:) 2525:p 2523:( 2520:s 2516:f 2512:p 2508:s 2506:( 2501:N 2497:M 2491:s 2485:K 2481:M 2478:| 2476:f 2471:K 2467:M 2464:| 2461:s 2457:f 2452:M 2448:K 2443:f 2439:0 2436:f 2430:N 2426:M 2421:s 2417:f 2412:f 2408:) 2406:f 2404:( 2402:E 2390:M 2378:g 2374:M 2368:g 2346:g 2338:d 2334:) 2331:f 2328:( 2325:e 2320:M 2312:= 2309:) 2306:f 2303:( 2300:E 2287:f 2279:M 2275:M 2271:M 2267:) 2265:f 2263:( 2261:e 2256:g 2252:M 2248:| 2239:2 2236:/ 2233:1 2221:f 2217:M 2214:T 2205:N 2201:M 2184:. 2181:) 2178:f 2163:h 2159:( 2151:j 2147:x 2132:f 2117:i 2113:x 2098:f 2086:j 2083:i 2079:g 2073:n 2068:1 2065:= 2052:n 2047:1 2044:= 2031:m 2026:1 2023:= 2020:j 2010:m 2005:1 2002:= 1999:i 1989:2 1986:1 1971:U 1967:f 1950:M 1946:p 1942:T 1935:p 1931:g 1924:m 1920:e 1916:1 1913:e 1895:) 1890:i 1886:e 1882:, 1877:i 1873:e 1869:( 1864:p 1858:) 1852:) 1849:f 1846:d 1843:( 1835:( 1828:m 1823:1 1820:= 1817:i 1809:= 1804:p 1800:) 1796:f 1790:( 1776:N 1773:) 1771:p 1769:( 1767:f 1763:T 1758:M 1754:p 1750:f 1746:M 1738:f 1733:f 1729:f 1721:g 1714:f 1709:N 1705:T 1701:M 1699:p 1697:T 1693:M 1691:p 1689:T 1682:p 1668:M 1664:p 1660:M 1652:f 1648:M 1645:T 1641:M 1638:T 1633:) 1622:N 1618:M 1602:f 1598:M 1595:T 1589:N 1585:T 1581:M 1579:p 1577:T 1567:p 1558:M 1554:p 1550:M 1542:f 1538:M 1535:T 1514:N 1510:M 1506:f 1498:) 1496:h 1492:N 1490:( 1486:) 1484:g 1480:M 1478:( 1456:. 1446:j 1443:i 1439:) 1435:f 1432:d 1429:( 1421:j 1418:i 1414:g 1408:m 1403:1 1400:= 1397:j 1387:m 1382:1 1379:= 1376:i 1368:= 1359:) 1355:f 1349:( 1336:U 1332:) 1330:f 1324:n 1320:α 1303:. 1300:f 1280:) 1276:h 1273:( 1262:j 1258:x 1243:f 1228:i 1224:x 1209:f 1197:n 1192:1 1189:= 1176:n 1171:1 1168:= 1157:+ 1149:k 1145:x 1130:f 1118:k 1113:j 1110:i 1106:) 1102:g 1099:( 1091:m 1086:1 1083:= 1080:k 1064:j 1060:x 1051:i 1047:x 1032:f 1026:2 1015:= 1005:j 1002:i 998:) 994:f 991:d 988:( 972:U 963:) 955:n 951:α 947:m 943:j 939:i 935:V 931:U 927:f 904:) 890:y 872:h 850:y 832:h 822:+ 810:y 792:h 780:( 766:h 760:n 755:1 752:= 739:2 736:1 731:= 710:) 706:h 703:( 691:) 677:x 666:j 663:i 659:g 641:j 637:x 623:i 619:g 609:+ 601:i 597:x 583:j 579:g 567:( 557:k 553:g 547:m 542:1 539:= 526:2 523:1 518:= 509:k 504:j 501:i 497:) 493:g 490:( 468:V 460:) 458:h 450:U 442:) 440:g 431:m 426:Îł 422:ÎČ 418:α 413:n 408:k 404:j 400:i 387:n 383:n 378:V 374:q 370:V 360:h 355:m 351:ÎČ 347:α 331:m 327:m 322:U 318:p 314:U 304:g 299:n 295:j 291:i 287:ℝ 283:V 278:ℝ 269:U 146:N 142:M 138:f 134:N 130:M 126:f 76:) 70:( 65:) 61:( 47:. 20:.

Index

harmonic function
references
inline citations
improve
introducing
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differential geometry
Riemannian manifolds
partial differential equation
Euler-Lagrange equation
Dirichlet energy
unit-speed geodesics
Riemannian geometry
harmonic functions
rubber band
James Eells
Joseph Sampson
deformed
Richard Hamilton
Ricci flow
geometric analysis
Karen Uhlenbeck
Simon Donaldson
Mikhael Gromov
pseudoholomorphic curves
symplectic geometry
quantum cohomology
Richard Schoen
Riemannian manifolds
local coordinates

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