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Germ (mathematics)

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As noted earlier, sets of germs may have algebraic structures such as being rings. In many situations, rings of germs are not arbitrary rings but instead have quite specific properties.
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Interpreting germs through sheaves also gives a general explanation for the presence of algebraic structures on sets of germs. The reason is that formation of stalks preserves finite
2843: 2781: 1541: 1502: 3141: 2742: 3067: 1668: 1577: 1634: 1287: 930: 619: 336: 2648: 1819: 1696: 1246: 1199: 1376: 3432:{\displaystyle {_{n}{\mathcal {C}}^{0}},{_{n}{\mathcal {C}}^{k}},{_{n}{\mathcal {C}}^{\infty }},{_{n}{\mathcal {C}}^{\omega }},{_{n}{\mathcal {O}}},{_{n}{\mathfrak {V}}}} 2375: 138: 257: 3267: 2313: 1098: 4498: 4451: 2348: 3507: 3235: 2467: 2418: 2105: 1853: 4471: 4424: 3477: 3457: 3205: 3185: 3165: 3103: 3034: 2972: 2910: 2888: 2866: 2805: 2708: 2688: 2668: 2091: 1987: 1967: 1780: 1760: 186: 166: 657: 3729: 353:(be it on maps or sets), and the equivalence classes are called germs (map-germs, or set-germs accordingly). The equivalence relation is usually written 4087: 1381: 3723:
would imply that a smooth function whose Taylor series vanished would be the zero function. But this is false, as can be seen by considering
3847: 3534:, and indeed the Taylor series of a germ (of a differentiable function) is defined: you only need local information to compute derivatives. 3630:-times differentiable, smooth, or analytic functions on a real manifold (when such functions are defined); for holomorphic functions on a 35:
of that object and others of the same kind that captures their shared local properties. In particular, the objects in question are mostly
3634:; and for regular functions on an algebraic variety. The property that rings of germs are local rings is axiomatized by the theory of 359: 2223: 3656: 2533: 2005: 1868: 59:); it is however necessary that the space on/in which the object is defined is a topological space, in order that the word 4541:
Mozyrska, Dorota; Bartosiewicz, Zbigniew (2006). "Systems of germs and theorems of zeros in infinite-dimensional spaces".
4013: 456: 47:. In specific implementations of this idea, the functions or subsets in question will have some property, such as being 3109:
For germs of sets and varieties, the notation is not so well established: some notations found in literature include:
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As a consequence, germs, constituting stalks of sheaves of various kind of functions, borrow this scheme of notation:
4397: 4381: 4319: 4295: 790: 3989:{\displaystyle \cdots \subsetneq (x^{-j+1}f(x))\subsetneq (x^{-j}f(x))\subsetneq (x^{-j-1}f(x))\subsetneq \cdots .} 2979: 2917: 3642: 2495: 1210: 837: 4524: 3538: 2812: 2750: 1507: 1468: 633: 4519: 3843: 3115: 2713: 193: 3041: 1642: 1550: 4374: 3720: 3561: 1606: 1259: 903: 565: 300: 3641:
The types of local rings that arise, however, depend closely on the theory under consideration. The
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one. It therefore makes little or no sense to talk of a convergent sequence of germs. However, if
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Varietà differenziabili e coomologia di De Rham (Differentiable manifolds and De Rham cohomology)
2353: 2094: 1702: 105: 218: 36: 3240: 4575: 3588: 3573: 3565: 2298: 1342: 1077: 2200:{\displaystyle C^{\infty }(X,Y)=\bigcap \nolimits _{k}C^{k}(X,Y)\subseteq {\mbox{Hom}}(X,Y)} 4476: 4429: 3635: 3592: 2433: 2326: 1322: 1298: 350: 4514: 8: 4246: 3486: 3214: 2606: 2446: 2397: 1937: 1832: 1222: 1025: 720:{\displaystyle S\sim _{x}T\Longleftrightarrow \mathbf {1} _{S}\sim _{x}\mathbf {1} _{T}.} 78: 56: 1782:
have additional structure, it is possible to define subsets of the set of all maps from
4542: 4456: 4409: 4231: 3550: 3546: 3462: 3442: 3190: 3170: 3150: 3088: 3082: 3019: 2957: 2895: 2873: 2851: 2790: 2693: 2673: 2653: 2076: 1972: 1952: 1856: 1765: 1745: 1698:. This equivalence relation is an abstraction of the germ equivalence described above. 1113: 644: 171: 151: 16:
Equivalence class of objects sharing local properties at a point in a topological space
3832:{\displaystyle f(x)={\begin{cases}e^{-1/x^{2}},&x\neq 0,\\0,&x=0.\end{cases}}} 3626:. This is the case, for example, for continuous functions on a topological space; for 4570: 4393: 4377: 4334: 4315: 4291: 3577: 2478: 2470: 2320: 2292: 1306: 1152: 1136: 1132: 994: 965: 940: 145: 48: 40: 32: 28: 4554: 4279: 4226: 3631: 3074: 2474: 1334: 4191:{\displaystyle f=|f|^{1/2}\cdot {\big (}\operatorname {sgn} (f)|f|^{1/2}{\big )},} 81:
metaphor, as a germ is (locally) the "heart" of a function, as it is for a grain.
4366: 4287: 4241: 3646: 3557: 2212: 52: 55:, but in general this is not needed (the functions in question need not even be 4530: 3584: 3525: 2846: 2316: 1710: 628:
is then intended as an entire equivalence class of maps, using the same letter
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of this ring consists of all germs that vanish at the origin, and the power
4236: 3650: 3569: 3480: 2429: 1450:{\displaystyle \mathrm {res} _{VU}:{\mathcal {F}}(U)\to {\mathcal {F}}(V),} 1314: 1109: 1002: 4270:
Tu, L. W. (2007). An introduction to manifolds. New York: Springer. p. 11.
4214: 3542: 2610: 739:, and in particular they don't need to have the same domain. However, if 73: 20: 3704:. This ring is local but not Noetherian. To see why, observe that the 1221:
The idea of germs is behind the definition of sheaves and presheaves. A
4534: 4338: 3623: 3719:− 1 derivatives vanish. If this ring were Noetherian, then the 4547: 1001:, etc. Similarly for subsets: if one representative of a germ is an 1795: 1791: 1148: 1005:
then so are all representatives, at least on some neighbourhood of
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of map(-germs)) do have topologies as they can be identified with
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space of germs of infinitely differentiable ("smooth") functions
3850:, but there is an infinite ascending chain of principal ideals 2216: 2098: 1994: 44: 3591:. A tangent vector can be viewed as a point-derivation on the 3237:), it can be dropped in each of the above symbols: also, when 408:{\displaystyle f\sim _{x}g\quad {\text{or}}\quad S\sim _{x}T.} 3528:
of a function at a point can be studied by analyzing its germ
3610:
is a space of some sort. It is often the case that, at each
993:, then they share all local properties, such as continuity, 3825: 2280:{\displaystyle C^{\omega }(X,Y)\subseteq {\mbox{Hom}}(X,Y)} 4213:, whence the conclusion. This is related to the setup of 3700:
be the ring of germs at the origin of smooth functions on
3693:{\displaystyle {\mathcal {C}}_{0}^{\infty }(\mathbf {R} )} 3645:
implies that rings of germs of holomorphic functions are
3572:, and thus the set of germs can be considered to be the 3269:, a subscript before the symbol can be added. As example 2598:{\displaystyle \{g:\exists x\forall y>x\,f(y)=g(y)\}} 2256: 2176: 2038: 1901: 4479: 4459: 4432: 4412: 4090: 4016: 3859: 3732: 3659: 3489: 3465: 3445: 3277: 3243: 3217: 3193: 3173: 3153: 3118: 3091: 3044: 3022: 2982: 2960: 2920: 2898: 2876: 2854: 2815: 2793: 2753: 2716: 2696: 2676: 2656: 2632: 2536: 2498: 2449: 2436:
between them can be defined, and therefore spaces of
2400: 2356: 2329: 2301: 2226: 2108: 2079: 2062:{\displaystyle C^{k}(X,Y)\subseteq {\mbox{Hom}}(X,Y)} 2008: 1975: 1955: 1925:{\displaystyle C^{0}(X,Y)\subseteq {\mbox{Hom}}(X,Y)} 1871: 1835: 1803: 1768: 1748: 1680: 1645: 1609: 1553: 1510: 1471: 1384: 1358: 1262: 1230: 1160: 1080: 906: 840: 793: 660: 568: 459: 362: 303: 221: 174: 154: 108: 4540: 4050:{\displaystyle {\mathcal {C}}_{0}^{0}(\mathbf {R} )} 4309: 1028:, then it makes sense to multiply germs: to define 4492: 4465: 4445: 4418: 4190: 4057:of germs at the origin of continuous functions on 4049: 3988: 3831: 3692: 3537:Germs are useful in determining the properties of 3501: 3471: 3451: 3431: 3261: 3229: 3199: 3179: 3159: 3135: 3097: 3061: 3028: 3004: 2966: 2942: 2904: 2882: 2860: 2837: 2799: 2775: 2736: 2702: 2682: 2662: 2642: 2597: 2518: 2461: 2412: 2369: 2342: 2307: 2279: 2199: 2085: 2061: 1981: 1961: 1924: 1847: 1813: 1774: 1754: 1690: 1662: 1628: 1571: 1535: 1496: 1449: 1370: 1281: 1240: 1193: 1092: 932:. This is particularly relevant in two settings: 924: 888: 826: 719: 613: 525:{\displaystyle _{x}=\{g:X\to Y\mid g\sim _{x}f\}.} 524: 407: 330: 251: 180: 160: 132: 1016:are inherited by the set of germs with values in 4562: 4387: 4278: 4343:Analytic Functions of Several Complex Variables 1297:. Typical examples of abelian groups here are: 827:{\displaystyle S\cap U=T\cap U\neq \emptyset ,} 4453:(Germs of differentiable functions at a point 4406:Germi di funzioni differenziabili in un punto 4180: 4130: 4061:even has the property that its maximal ideal 3848:ascending chain condition on principal ideals 3518:The key word in the applications of germs is 2481:) functions between them can be defined, and 4357:The Elementary Properties of the Local Rings 3583:Germs can also be used in the definition of 3005:{\displaystyle {\mathcal {C}}_{x}^{\omega }} 2943:{\displaystyle {\mathcal {C}}_{x}^{\infty }} 2592: 2537: 2526:at positive infinity (or simply the germ of 639:Notice that two sets are germ-equivalent at 516: 479: 4302:, chapter I, paragraph 6, subparagraph 10 " 3556:When the topological spaces considered are 2519:{\displaystyle f:\mathbb {R} \rightarrow Y} 4553:A research preprint dealing with germs of 4546: 4205:| vanishes at the origin, this expresses 3439:are the spaces of germs shown above when 2564: 2506: 889:{\displaystyle f|_{S\cap V}=g|_{T\cap V}} 4314:(2nd ed.). North-Holland Elsevier. 4201:where sgn is the sign function. Since | 3846:. This is because all UFDs satisfy the 1216: 997:etc., so it makes sense to talk about a 3649:. It can also be shown that these are 3598: 3071:space of germs of holomorphic functions 4563: 4513:Chirka, Evgeniǐ Mikhaǐlovich (2001) , 4512: 4312:Analysis on Real and Complex Manifolds 2838:{\displaystyle {\mathcal {C}}_{x}^{k}} 2785:space of germs of continuous functions 2776:{\displaystyle {\mathcal {C}}_{x}^{0}} 1536:{\displaystyle g\in {\mathcal {F}}(V)} 1497:{\displaystyle f\in {\mathcal {F}}(U)} 4353:Local Rings of Holomorphic Functions 3715:consists of those germs whose first 3618:, the ring of germs of functions at 3545:: they are one of the main tools in 3145:space of germs of analytic varieties 3014:space of germs of analytic functions 1636:). The equivalence classes form the 282:, then they define the same germ at 84: 4557:in an infinite dimensional setting. 4209:as the product of two functions in 3423: 3136:{\displaystyle {\mathfrak {V}}_{x}} 3122: 3079:space of germs of regular functions 2737:{\displaystyle {\mathcal {F}}_{x}.} 2138: 1012:Algebraic structures on the target 976: 735:Maps need not be defined on all of 89: 13: 4020: 3999:The inclusions are strict because 3674: 3663: 3402: 3375: 3353: 3347: 3319: 3291: 3062:{\displaystyle {\mathcal {O}}_{x}} 3048: 2986: 2935: 2924: 2819: 2757: 2720: 2635: 2552: 2546: 2379:germs of (finitely) differentiable 2362: 2114: 1806: 1683: 1663:{\displaystyle {\mathcal {F}}_{x}} 1649: 1612: 1572:{\displaystyle W\subseteq U\cap V} 1519: 1480: 1430: 1411: 1393: 1390: 1387: 1265: 1233: 818: 341:It is straightforward to see that 286:if there is again a neighbourhood 14: 4587: 4506: 1629:{\displaystyle {\mathcal {F}}(W)} 1282:{\displaystyle {\mathcal {F}}(U)} 925:{\displaystyle x\in V\subseteq U} 896:, for some smaller neighbourhood 730: 614:{\displaystyle f:(X,x)\to (Y,y).} 4040: 3683: 1378:then there is a restriction map 1211:finite-dimensional vector spaces 704: 682: 331:{\displaystyle S\cap U=T\cap U.} 3643:Weierstrass preparation theorem 3530:. They are a generalization of 3513: 2890:-times-differentiable functions 1116:, then so is the set of germs. 1020:. For instance, if the target 999:differentiable or analytic germ 385: 379: 4284:General Topology. Chapters 1-4 4264: 4160: 4151: 4147: 4141: 4107: 4098: 4044: 4036: 3974: 3971: 3965: 3940: 3934: 3931: 3925: 3906: 3900: 3897: 3891: 3866: 3742: 3736: 3687: 3679: 3187:is fixed and known (e.g. when 2643:{\displaystyle {\mathcal {F}}} 2589: 2583: 2574: 2568: 2510: 2438:germs of holomorphic functions 2274: 2262: 2249: 2237: 2194: 2182: 2169: 2157: 2131: 2119: 2056: 2044: 2031: 2019: 1919: 1907: 1894: 1882: 1814:{\displaystyle {\mathcal {F}}} 1691:{\displaystyle {\mathcal {F}}} 1623: 1617: 1530: 1524: 1491: 1485: 1441: 1435: 1425: 1422: 1416: 1276: 1270: 1241:{\displaystyle {\mathcal {F}}} 1194:{\displaystyle J_{x}^{k}(X,Y)} 1188: 1176: 870: 846: 677: 605: 593: 590: 587: 575: 491: 467: 460: 246: 240: 231: 225: 124: 1: 4326:, chapter 2, paragraph 2.1, " 4257: 1942:germs of continuous functions 1070:of the pointwise product map 1039:, first take representatives 4310:Raghavan Narasimhan (1973). 3541:near chosen points of their 1823:some notable examples follow 1547:if there is a neighbourhood 1371:{\displaystyle V\subseteq U} 1047:, defined on neighbourhoods 960:, so is not even defined at 7: 4520:Encyclopedia of Mathematics 4355:", especially paragraph A " 4220: 3844:unique factorization domain 2617: 2605:. These germs are used in 2370:{\displaystyle C^{\infty }} 1737: 956:has a pole of some sort at 10: 4592: 4375:Cambridge University Press 3721:Krull intersection theorem 3653:. On the other hand, let 3562:complex analytic varieties 2483:germs of regular functions 624:When using this notation, 133:{\displaystyle f,g:X\to Y} 4388:Giuseppe Tallini (1973). 4371:Geometric Differentiation 3568:on them can be viewed as 2319:for infinity; this is an 1821:and corresponding germs: 1721:-algebra, then any stalk 1465:, one says that elements 1337:), constant functions on 1256:assigns an abelian group 1055:respectively, and define 968:, which would be defined 436:. Similarly, the germ at 252:{\displaystyle f(u)=g(u)} 77:in a continuation of the 71:The name is derived from 4531:Germ of smooth functions 4003:is in the maximal ideal 3842:This ring is also not a 3595:of germs at that point. 3262:{\displaystyle \dim X=n} 3209:topological vector space 2095:differentiable functions 1991:differentiable structure 1459:compatibility conditions 1100:). In the same way, if 645:characteristic functions 215:are equal; meaning that 203:such that restricted to 188:define the same germ at 2710:is commonly denoted by 2650:on a topological space 2308:{\displaystyle \omega } 1705:. This implies that if 1252:on a topological space 1131:does not have a useful 1093:{\displaystyle U\cap V} 989:are germ equivalent at 783:are germ equivalent at 767:are germ equivalent at 647:are germ-equivalent at 278:are any two subsets of 98:of a topological space 66: 4494: 4467: 4447: 4420: 4392:. Edizioni Cremonese. 4286:(paperback ed.). 4192: 4051: 3990: 3833: 3694: 3503: 3473: 3453: 3433: 3263: 3231: 3201: 3181: 3161: 3137: 3099: 3063: 3030: 3006: 2968: 2944: 2906: 2884: 2862: 2839: 2801: 2777: 2738: 2704: 2684: 2664: 2644: 2599: 2520: 2463: 2414: 2377:), and then spaces of 2371: 2344: 2309: 2281: 2201: 2087: 2063: 1983: 1963: 1926: 1849: 1815: 1790:or more generally sub- 1776: 1756: 1692: 1664: 1630: 1573: 1537: 1498: 1451: 1372: 1343:differential operators 1283: 1242: 1195: 1094: 926: 890: 828: 721: 615: 526: 409: 343:defining the same germ 332: 253: 182: 162: 134: 4495: 4493:{\displaystyle V_{n}} 4468: 4448: 4446:{\displaystyle V_{n}} 4421: 4193: 4052: 3991: 3834: 3695: 3636:locally ringed spaces 3589:differential geometry 3574:analytic continuation 3566:holomorphic functions 3504: 3474: 3454: 3434: 3264: 3232: 3202: 3182: 3162: 3138: 3100: 3064: 3031: 3007: 2969: 2945: 2907: 2885: 2863: 2840: 2802: 2778: 2739: 2705: 2685: 2665: 2645: 2600: 2521: 2464: 2434:holomorphic functions 2430:complex vector spaces 2415: 2372: 2345: 2343:{\displaystyle C^{k}} 2310: 2282: 2202: 2088: 2064: 1984: 1964: 1927: 1850: 1816: 1777: 1757: 1693: 1665: 1631: 1574: 1538: 1499: 1452: 1373: 1323:holomorphic functions 1299:real-valued functions 1284: 1243: 1217:Relation with sheaves 1196: 1151:, then the spaces of 1095: 1074:(which is defined on 927: 891: 829: 722: 643:if and only if their 616: 527: 410: 333: 254: 183: 163: 135: 27:of an object in/on a 4477: 4457: 4430: 4410: 4088: 4014: 3857: 3730: 3657: 3599:Algebraic properties 3487: 3463: 3443: 3275: 3241: 3215: 3191: 3171: 3151: 3116: 3089: 3042: 3020: 2980: 2958: 2918: 2896: 2874: 2852: 2813: 2791: 2751: 2714: 2694: 2674: 2654: 2630: 2534: 2496: 2447: 2398: 2354: 2327: 2299: 2224: 2106: 2093:-times continuously 2077: 2006: 1973: 1953: 1938:continuous functions 1869: 1833: 1801: 1766: 1746: 1678: 1643: 1607: 1603:) (both elements of 1551: 1508: 1469: 1382: 1356: 1260: 1228: 1158: 1119:The set of germs at 1078: 904: 838: 791: 658: 566: 543:that maps the point 457: 360: 351:equivalence relation 301: 219: 172: 152: 106: 4359:" and paragraph E " 4035: 3678: 3502:{\displaystyle x=0} 3230:{\displaystyle x=0} 3001: 2939: 2834: 2772: 2607:asymptotic analysis 2471:algebraic structure 2462:{\displaystyle X,Y} 2440:can be constructed. 2424:(for instance, are 2413:{\displaystyle X,Y} 2389:can be constructed. 1848:{\displaystyle X,Y} 1457:satisfying certain 1175: 964:, as for example a 430:is usually denoted 426:, then its germ at 4555:analytic varieties 4490: 4463: 4443: 4416: 4361:Germs of Varieties 4232:Catastrophe theory 4215:almost ring theory 4188: 4081:can be written as 4047: 4017: 3986: 3829: 3824: 3690: 3660: 3560:or more generally 3551:catastrophe theory 3547:singularity theory 3499: 3469: 3449: 3429: 3259: 3227: 3197: 3177: 3157: 3133: 3095: 3083:algebraic geometry 3059: 3026: 3002: 2983: 2964: 2940: 2921: 2902: 2880: 2870:space of germs of 2858: 2835: 2816: 2797: 2773: 2754: 2734: 2700: 2680: 2660: 2640: 2595: 2516: 2459: 2410: 2387:analytic functions 2367: 2340: 2323:, by analogy with 2305: 2293:analytic functions 2277: 2260: 2197: 2180: 2083: 2059: 2042: 1979: 1959: 1922: 1905: 1857:topological spaces 1845: 1811: 1772: 1752: 1688: 1660: 1626: 1569: 1543:are equivalent at 1533: 1494: 1447: 1368: 1307:differential forms 1279: 1238: 1191: 1161: 1090: 1066:to be the germ at 922: 886: 834:and then moreover 824: 755:, both subsets of 717: 611: 522: 405: 328: 249: 178: 158: 130: 63:has some meaning. 23:, the notion of a 4466:{\displaystyle P} 4419:{\displaystyle P} 4404:, paragraph 31, " 4335:Robert C. Gunning 4328:Basic Definitions 3578:analytic function 3539:dynamical systems 3472:{\displaystyle n} 3452:{\displaystyle X} 3200:{\displaystyle X} 3180:{\displaystyle x} 3167:. When the point 3160:{\displaystyle x} 3098:{\displaystyle x} 3029:{\displaystyle x} 2967:{\displaystyle x} 2905:{\displaystyle x} 2883:{\displaystyle k} 2861:{\displaystyle k} 2800:{\displaystyle x} 2703:{\displaystyle X} 2683:{\displaystyle x} 2663:{\displaystyle X} 2489:) can be defined. 2422:complex structure 2321:abuse of notation 2259: 2179: 2086:{\displaystyle k} 2041: 1982:{\displaystyle Y} 1962:{\displaystyle X} 1904: 1775:{\displaystyle Y} 1755:{\displaystyle X} 1289:to each open set 1135:, except for the 995:differentiability 966:rational function 383: 181:{\displaystyle g} 161:{\displaystyle f} 85:Formal definition 33:equivalence class 29:topological space 4583: 4552: 4550: 4527: 4499: 4497: 4496: 4491: 4489: 4488: 4472: 4470: 4469: 4464: 4452: 4450: 4449: 4444: 4442: 4441: 4425: 4423: 4422: 4417: 4403: 4350: 4325: 4304:Germs at a point 4301: 4280:Nicolas Bourbaki 4271: 4268: 4227:Analytic variety 4197: 4195: 4194: 4189: 4184: 4183: 4177: 4176: 4172: 4163: 4154: 4134: 4133: 4124: 4123: 4119: 4110: 4101: 4056: 4054: 4053: 4048: 4043: 4034: 4029: 4024: 4023: 3995: 3993: 3992: 3987: 3961: 3960: 3921: 3920: 3887: 3886: 3838: 3836: 3835: 3830: 3828: 3827: 3783: 3782: 3781: 3780: 3771: 3699: 3697: 3696: 3691: 3686: 3677: 3672: 3667: 3666: 3647:Noetherian rings 3632:complex manifold 3558:Riemann surfaces 3526:local properties 3508: 3506: 3505: 3500: 3478: 3476: 3475: 3470: 3458: 3456: 3455: 3450: 3438: 3436: 3435: 3430: 3428: 3427: 3426: 3420: 3419: 3407: 3406: 3405: 3399: 3398: 3386: 3385: 3384: 3379: 3378: 3371: 3370: 3358: 3357: 3356: 3351: 3350: 3343: 3342: 3330: 3329: 3328: 3323: 3322: 3315: 3314: 3302: 3301: 3300: 3295: 3294: 3287: 3286: 3268: 3266: 3265: 3260: 3236: 3234: 3233: 3228: 3206: 3204: 3203: 3198: 3186: 3184: 3183: 3178: 3166: 3164: 3163: 3158: 3142: 3140: 3139: 3134: 3132: 3131: 3126: 3125: 3104: 3102: 3101: 3096: 3075:complex geometry 3068: 3066: 3065: 3060: 3058: 3057: 3052: 3051: 3035: 3033: 3032: 3027: 3011: 3009: 3008: 3003: 3000: 2995: 2990: 2989: 2973: 2971: 2970: 2965: 2949: 2947: 2946: 2941: 2938: 2933: 2928: 2927: 2911: 2909: 2908: 2903: 2889: 2887: 2886: 2881: 2867: 2865: 2864: 2859: 2844: 2842: 2841: 2836: 2833: 2828: 2823: 2822: 2806: 2804: 2803: 2798: 2782: 2780: 2779: 2774: 2771: 2766: 2761: 2760: 2743: 2741: 2740: 2735: 2730: 2729: 2724: 2723: 2709: 2707: 2706: 2701: 2689: 2687: 2686: 2681: 2669: 2667: 2666: 2661: 2649: 2647: 2646: 2641: 2639: 2638: 2604: 2602: 2601: 2596: 2529: 2525: 2523: 2522: 2517: 2509: 2468: 2466: 2465: 2460: 2419: 2417: 2416: 2411: 2376: 2374: 2373: 2368: 2366: 2365: 2349: 2347: 2346: 2341: 2339: 2338: 2314: 2312: 2311: 2306: 2295:can be defined ( 2286: 2284: 2283: 2278: 2261: 2257: 2236: 2235: 2213:smooth functions 2206: 2204: 2203: 2198: 2181: 2177: 2156: 2155: 2146: 2145: 2118: 2117: 2092: 2090: 2089: 2084: 2068: 2066: 2065: 2060: 2043: 2039: 2018: 2017: 1988: 1986: 1985: 1980: 1968: 1966: 1965: 1960: 1931: 1929: 1928: 1923: 1906: 1902: 1881: 1880: 1854: 1852: 1851: 1846: 1820: 1818: 1817: 1812: 1810: 1809: 1781: 1779: 1778: 1773: 1761: 1759: 1758: 1753: 1697: 1695: 1694: 1689: 1687: 1686: 1674:of the presheaf 1669: 1667: 1666: 1661: 1659: 1658: 1653: 1652: 1635: 1633: 1632: 1627: 1616: 1615: 1578: 1576: 1575: 1570: 1542: 1540: 1539: 1534: 1523: 1522: 1503: 1501: 1500: 1495: 1484: 1483: 1456: 1454: 1453: 1448: 1434: 1433: 1415: 1414: 1405: 1404: 1396: 1377: 1375: 1374: 1369: 1335:complex manifold 1288: 1286: 1285: 1280: 1269: 1268: 1247: 1245: 1244: 1239: 1237: 1236: 1200: 1198: 1197: 1192: 1174: 1169: 1099: 1097: 1096: 1091: 977:Basic properties 939:is defined on a 931: 929: 928: 923: 895: 893: 892: 887: 885: 884: 873: 861: 860: 849: 833: 831: 830: 825: 726: 724: 723: 718: 713: 712: 707: 701: 700: 691: 690: 685: 673: 672: 620: 618: 617: 612: 531: 529: 528: 523: 512: 511: 475: 474: 414: 412: 411: 406: 398: 397: 384: 381: 375: 374: 337: 335: 334: 329: 258: 256: 255: 250: 187: 185: 184: 179: 167: 165: 164: 159: 139: 137: 136: 131: 90:Basic definition 4591: 4590: 4586: 4585: 4584: 4582: 4581: 4580: 4561: 4560: 4509: 4502:" (in Italian). 4484: 4480: 4478: 4475: 4474: 4458: 4455: 4454: 4437: 4433: 4431: 4428: 4427: 4411: 4408: 4407: 4400: 4367:Ian R. Porteous 4322: 4298: 4288:Springer-Verlag 4275: 4274: 4269: 4265: 4260: 4242:Riemann surface 4223: 4179: 4178: 4168: 4164: 4159: 4158: 4150: 4129: 4128: 4115: 4111: 4106: 4105: 4097: 4089: 4086: 4085: 4039: 4030: 4025: 4019: 4018: 4015: 4012: 4011: 3947: 3943: 3913: 3909: 3873: 3869: 3858: 3855: 3854: 3823: 3822: 3811: 3802: 3801: 3787: 3776: 3772: 3767: 3760: 3756: 3749: 3748: 3731: 3728: 3727: 3682: 3673: 3668: 3662: 3661: 3658: 3655: 3654: 3601: 3585:tangent vectors 3516: 3488: 3485: 3484: 3464: 3461: 3460: 3444: 3441: 3440: 3422: 3421: 3415: 3412: 3411: 3401: 3400: 3394: 3391: 3390: 3380: 3374: 3373: 3372: 3366: 3363: 3362: 3352: 3346: 3345: 3344: 3338: 3335: 3334: 3324: 3318: 3317: 3316: 3310: 3307: 3306: 3296: 3290: 3289: 3288: 3282: 3279: 3278: 3276: 3273: 3272: 3242: 3239: 3238: 3216: 3213: 3212: 3192: 3189: 3188: 3172: 3169: 3168: 3152: 3149: 3148: 3127: 3121: 3120: 3119: 3117: 3114: 3113: 3090: 3087: 3086: 3053: 3047: 3046: 3045: 3043: 3040: 3039: 3021: 3018: 3017: 2996: 2991: 2985: 2984: 2981: 2978: 2977: 2959: 2956: 2955: 2934: 2929: 2923: 2922: 2919: 2916: 2915: 2897: 2894: 2893: 2875: 2872: 2871: 2853: 2850: 2849: 2829: 2824: 2818: 2817: 2814: 2811: 2810: 2792: 2789: 2788: 2767: 2762: 2756: 2755: 2752: 2749: 2748: 2725: 2719: 2718: 2717: 2715: 2712: 2711: 2695: 2692: 2691: 2675: 2672: 2671: 2655: 2652: 2651: 2634: 2633: 2631: 2628: 2627: 2620: 2535: 2532: 2531: 2527: 2505: 2497: 2494: 2493: 2448: 2445: 2444: 2399: 2396: 2395: 2361: 2357: 2355: 2352: 2351: 2334: 2330: 2328: 2325: 2324: 2300: 2297: 2296: 2255: 2231: 2227: 2225: 2222: 2221: 2175: 2151: 2147: 2141: 2137: 2113: 2109: 2107: 2104: 2103: 2078: 2075: 2074: 2037: 2013: 2009: 2007: 2004: 2003: 1974: 1971: 1970: 1954: 1951: 1950: 1900: 1876: 1872: 1870: 1867: 1866: 1834: 1831: 1830: 1805: 1804: 1802: 1799: 1798: 1767: 1764: 1763: 1747: 1744: 1743: 1740: 1729: 1682: 1681: 1679: 1676: 1675: 1654: 1648: 1647: 1646: 1644: 1641: 1640: 1611: 1610: 1608: 1605: 1604: 1598: 1588: 1552: 1549: 1548: 1518: 1517: 1509: 1506: 1505: 1479: 1478: 1470: 1467: 1466: 1429: 1428: 1410: 1409: 1397: 1386: 1385: 1383: 1380: 1379: 1357: 1354: 1353: 1264: 1263: 1261: 1258: 1257: 1232: 1231: 1229: 1226: 1225: 1219: 1170: 1165: 1159: 1156: 1155: 1079: 1076: 1075: 1065: 1060: 1038: 1033: 979: 905: 902: 901: 874: 869: 868: 850: 845: 844: 839: 836: 835: 792: 789: 788: 733: 708: 703: 702: 696: 692: 686: 681: 680: 668: 664: 659: 656: 655: 567: 564: 563: 507: 503: 470: 466: 458: 455: 454: 449: 435: 393: 389: 380: 370: 366: 361: 358: 357: 302: 299: 298: 220: 217: 216: 173: 170: 169: 153: 150: 149: 107: 104: 103: 102:, and two maps 92: 87: 69: 17: 12: 11: 5: 4589: 4579: 4578: 4573: 4559: 4558: 4538: 4528: 4508: 4507:External links 4505: 4504: 4503: 4487: 4483: 4462: 4440: 4436: 4415: 4398: 4385: 4364: 4331: 4320: 4307: 4296: 4273: 4272: 4262: 4261: 4259: 4256: 4255: 4254: 4249: 4244: 4239: 4234: 4229: 4222: 4219: 4199: 4198: 4187: 4182: 4175: 4171: 4167: 4162: 4157: 4153: 4149: 4146: 4143: 4140: 4137: 4132: 4127: 4122: 4118: 4114: 4109: 4104: 4100: 4096: 4093: 4046: 4042: 4038: 4033: 4028: 4022: 3997: 3996: 3985: 3982: 3979: 3976: 3973: 3970: 3967: 3964: 3959: 3956: 3953: 3950: 3946: 3942: 3939: 3936: 3933: 3930: 3927: 3924: 3919: 3916: 3912: 3908: 3905: 3902: 3899: 3896: 3893: 3890: 3885: 3882: 3879: 3876: 3872: 3868: 3865: 3862: 3840: 3839: 3826: 3821: 3818: 3815: 3812: 3810: 3807: 3804: 3803: 3800: 3797: 3794: 3791: 3788: 3786: 3779: 3775: 3770: 3766: 3763: 3759: 3755: 3754: 3752: 3747: 3744: 3741: 3738: 3735: 3689: 3685: 3681: 3676: 3671: 3665: 3600: 3597: 3515: 3512: 3511: 3510: 3498: 3495: 3492: 3468: 3448: 3425: 3418: 3414: 3410: 3404: 3397: 3393: 3389: 3383: 3377: 3369: 3365: 3361: 3355: 3349: 3341: 3337: 3333: 3327: 3321: 3313: 3309: 3305: 3299: 3293: 3285: 3281: 3270: 3258: 3255: 3252: 3249: 3246: 3226: 3223: 3220: 3196: 3176: 3156: 3130: 3124: 3107: 3106: 3094: 3056: 3050: 3037: 3025: 2999: 2994: 2988: 2975: 2963: 2937: 2932: 2926: 2913: 2901: 2879: 2857: 2847:natural number 2832: 2827: 2821: 2808: 2796: 2770: 2765: 2759: 2733: 2728: 2722: 2699: 2679: 2659: 2637: 2619: 2616: 2615: 2614: 2594: 2591: 2588: 2585: 2582: 2579: 2576: 2573: 2570: 2567: 2563: 2560: 2557: 2554: 2551: 2548: 2545: 2542: 2539: 2515: 2512: 2508: 2504: 2501: 2490: 2485:(and likewise 2458: 2455: 2452: 2441: 2409: 2406: 2403: 2391: 2390: 2364: 2360: 2337: 2333: 2304: 2289: 2288: 2287: 2276: 2273: 2270: 2267: 2264: 2254: 2251: 2248: 2245: 2242: 2239: 2234: 2230: 2209: 2208: 2207: 2196: 2193: 2190: 2187: 2184: 2174: 2171: 2168: 2165: 2162: 2159: 2154: 2150: 2144: 2140: 2136: 2133: 2130: 2127: 2124: 2121: 2116: 2112: 2082: 2071: 2070: 2069: 2058: 2055: 2052: 2049: 2046: 2036: 2033: 2030: 2027: 2024: 2021: 2016: 2012: 1998: 1997: 1978: 1958: 1946: 1945: 1934: 1933: 1932: 1921: 1918: 1915: 1912: 1909: 1899: 1896: 1893: 1890: 1887: 1884: 1879: 1875: 1861: 1860: 1844: 1841: 1838: 1808: 1771: 1751: 1739: 1736: 1725: 1711:Lawvere theory 1685: 1657: 1651: 1625: 1622: 1619: 1614: 1594: 1584: 1568: 1565: 1562: 1559: 1556: 1532: 1529: 1526: 1521: 1516: 1513: 1493: 1490: 1487: 1482: 1477: 1474: 1461:. For a fixed 1446: 1443: 1440: 1437: 1432: 1427: 1424: 1421: 1418: 1413: 1408: 1403: 1400: 1395: 1392: 1389: 1367: 1364: 1361: 1278: 1275: 1272: 1267: 1250:abelian groups 1235: 1218: 1215: 1201:(finite order 1190: 1187: 1184: 1181: 1178: 1173: 1168: 1164: 1089: 1086: 1083: 1061: 1056: 1034: 1029: 978: 975: 974: 973: 951: 921: 918: 915: 912: 909: 883: 880: 877: 872: 867: 864: 859: 856: 853: 848: 843: 823: 820: 817: 814: 811: 808: 805: 802: 799: 796: 732: 731:More generally 729: 728: 727: 716: 711: 706: 699: 695: 689: 684: 679: 676: 671: 667: 663: 634:representative 622: 621: 610: 607: 604: 601: 598: 595: 592: 589: 586: 583: 580: 577: 574: 571: 559:is denoted as 535:A map germ at 533: 532: 521: 518: 515: 510: 506: 502: 499: 496: 493: 490: 487: 484: 481: 478: 473: 469: 465: 462: 445: 431: 416: 415: 404: 401: 396: 392: 388: 378: 373: 369: 365: 339: 338: 327: 324: 321: 318: 315: 312: 309: 306: 270:Similarly, if 248: 245: 242: 239: 236: 233: 230: 227: 224: 192:if there is a 177: 157: 129: 126: 123: 120: 117: 114: 111: 94:Given a point 91: 88: 86: 83: 68: 65: 15: 9: 6: 4: 3: 2: 4588: 4577: 4574: 4572: 4569: 4568: 4566: 4556: 4549: 4544: 4539: 4536: 4532: 4529: 4526: 4522: 4521: 4516: 4511: 4510: 4501: 4485: 4481: 4460: 4438: 4434: 4413: 4401: 4399:88-7083-413-1 4395: 4391: 4386: 4383: 4382:0-521-00264-8 4379: 4376: 4372: 4368: 4365: 4362: 4358: 4354: 4351:, chapter 2 " 4348: 4347:Prentice-Hall 4344: 4340: 4336: 4332: 4329: 4323: 4321:0-7204-2501-8 4317: 4313: 4308: 4305: 4299: 4297:3-540-64241-2 4293: 4289: 4285: 4281: 4277: 4276: 4267: 4263: 4253: 4250: 4248: 4245: 4243: 4240: 4238: 4235: 4233: 4230: 4228: 4225: 4224: 4218: 4216: 4212: 4208: 4204: 4185: 4173: 4169: 4165: 4155: 4144: 4138: 4135: 4125: 4120: 4116: 4112: 4102: 4094: 4091: 4084: 4083: 4082: 4080: 4076: 4072: 4068: 4064: 4060: 4031: 4026: 4008: 4006: 4002: 3983: 3980: 3977: 3968: 3962: 3957: 3954: 3951: 3948: 3944: 3937: 3928: 3922: 3917: 3914: 3910: 3903: 3894: 3888: 3883: 3880: 3877: 3874: 3870: 3863: 3860: 3853: 3852: 3851: 3849: 3845: 3819: 3816: 3813: 3808: 3805: 3798: 3795: 3792: 3789: 3784: 3777: 3773: 3768: 3764: 3761: 3757: 3750: 3745: 3739: 3733: 3726: 3725: 3724: 3722: 3718: 3714: 3710: 3707: 3706:maximal ideal 3703: 3669: 3652: 3651:regular rings 3648: 3644: 3639: 3637: 3633: 3629: 3625: 3621: 3617: 3613: 3609: 3606:Suppose that 3604: 3596: 3594: 3590: 3586: 3581: 3579: 3575: 3571: 3567: 3563: 3559: 3554: 3552: 3548: 3544: 3540: 3535: 3533: 3532:Taylor series 3529: 3527: 3521: 3496: 3493: 3490: 3482: 3479:-dimensional 3466: 3446: 3416: 3413: 3408: 3395: 3392: 3387: 3381: 3367: 3364: 3359: 3339: 3336: 3331: 3325: 3311: 3308: 3303: 3297: 3283: 3280: 3271: 3256: 3253: 3250: 3247: 3244: 3224: 3221: 3218: 3210: 3194: 3174: 3154: 3146: 3128: 3112: 3111: 3110: 3092: 3084: 3080: 3076: 3072: 3054: 3038: 3023: 3015: 2997: 2992: 2976: 2961: 2953: 2930: 2914: 2899: 2891: 2877: 2855: 2848: 2830: 2825: 2809: 2794: 2786: 2768: 2763: 2747: 2746: 2745: 2731: 2726: 2697: 2677: 2657: 2625: 2612: 2608: 2586: 2580: 2577: 2571: 2565: 2561: 2558: 2555: 2549: 2543: 2540: 2513: 2502: 2499: 2491: 2488: 2484: 2480: 2476: 2472: 2456: 2453: 2450: 2442: 2439: 2435: 2431: 2427: 2423: 2407: 2404: 2401: 2393: 2392: 2388: 2384: 2380: 2358: 2335: 2331: 2322: 2318: 2302: 2294: 2290: 2271: 2268: 2265: 2252: 2246: 2243: 2240: 2232: 2228: 2220: 2219: 2218: 2214: 2210: 2191: 2188: 2185: 2172: 2166: 2163: 2160: 2152: 2148: 2142: 2134: 2128: 2125: 2122: 2110: 2102: 2101: 2100: 2096: 2080: 2072: 2053: 2050: 2047: 2034: 2028: 2025: 2022: 2014: 2010: 2002: 2001: 2000: 1999: 1996: 1992: 1976: 1956: 1948: 1947: 1943: 1939: 1935: 1916: 1913: 1910: 1897: 1891: 1888: 1885: 1877: 1873: 1865: 1864: 1863: 1862: 1858: 1842: 1839: 1836: 1828: 1827: 1826: 1824: 1797: 1793: 1789: 1785: 1769: 1749: 1735: 1733: 1728: 1724: 1720: 1716: 1712: 1708: 1704: 1699: 1673: 1655: 1639: 1620: 1602: 1597: 1592: 1587: 1582: 1566: 1563: 1560: 1557: 1554: 1546: 1527: 1514: 1511: 1488: 1475: 1472: 1464: 1460: 1444: 1438: 1419: 1406: 1401: 1398: 1365: 1362: 1359: 1350: 1348: 1344: 1340: 1336: 1332: 1328: 1324: 1320: 1316: 1315:vector fields 1312: 1308: 1304: 1300: 1296: 1292: 1273: 1255: 1251: 1224: 1214: 1212: 1208: 1204: 1203:Taylor series 1185: 1182: 1179: 1171: 1166: 1162: 1154: 1150: 1146: 1142: 1138: 1134: 1130: 1126: 1123:of maps from 1122: 1117: 1115: 1111: 1107: 1106:abelian group 1103: 1087: 1084: 1081: 1073: 1069: 1064: 1059: 1054: 1050: 1046: 1042: 1037: 1032: 1027: 1023: 1019: 1015: 1010: 1008: 1004: 1000: 996: 992: 988: 984: 972:a subvariety. 971: 967: 963: 959: 955: 952: 949: 945: 942: 938: 935: 934: 933: 919: 916: 913: 910: 907: 899: 881: 878: 875: 865: 862: 857: 854: 851: 841: 821: 815: 812: 809: 806: 803: 800: 797: 794: 786: 782: 778: 774: 770: 766: 762: 758: 754: 750: 746: 742: 738: 714: 709: 697: 693: 687: 674: 669: 665: 661: 654: 653: 652: 650: 646: 642: 637: 635: 631: 627: 608: 602: 599: 596: 584: 581: 578: 572: 569: 562: 561: 560: 558: 554: 551:to the point 550: 546: 542: 538: 519: 513: 508: 504: 500: 497: 494: 488: 485: 482: 476: 471: 463: 453: 452: 451: 448: 443: 439: 434: 429: 425: 421: 402: 399: 394: 390: 386: 376: 371: 367: 363: 356: 355: 354: 352: 348: 344: 325: 322: 319: 316: 313: 310: 307: 304: 297: 296: 295: 293: 289: 285: 281: 277: 273: 268: 266: 262: 243: 237: 234: 228: 222: 214: 210: 206: 202: 198: 195: 194:neighbourhood 191: 175: 155: 147: 143: 127: 121: 118: 115: 112: 109: 101: 97: 82: 80: 76: 75: 64: 62: 58: 54: 50: 46: 42: 38: 34: 30: 26: 22: 4576:Sheaf theory 4548:math/0612355 4518: 4405: 4389: 4370: 4360: 4356: 4352: 4342: 4327: 4311: 4303: 4283: 4266: 4237:Gluing axiom 4210: 4206: 4202: 4200: 4078: 4074: 4073:. Any germ 4070: 4066: 4062: 4058: 4009: 4004: 4000: 3998: 3841: 3716: 3712: 3708: 3701: 3640: 3627: 3619: 3615: 3611: 3607: 3605: 3602: 3582: 3570:power series 3555: 3536: 3523: 3519: 3517: 3514:Applications 3481:vector space 3144: 3108: 3078: 3070: 3013: 2951: 2869: 2784: 2621: 2611:Hardy fields 2486: 2482: 2437: 2386: 2382: 2378: 2315:here is the 1941: 1859:, the subset 1822: 1787: 1783: 1741: 1731: 1726: 1722: 1718: 1714: 1713:and a sheaf 1706: 1700: 1671: 1600: 1595: 1590: 1585: 1580: 1544: 1462: 1351: 1346: 1338: 1330: 1326: 1318: 1310: 1302: 1294: 1290: 1253: 1220: 1206: 1144: 1140: 1128: 1124: 1120: 1118: 1110:vector space 1101: 1071: 1067: 1062: 1057: 1052: 1048: 1044: 1040: 1035: 1030: 1021: 1017: 1013: 1011: 1006: 1003:analytic set 998: 990: 986: 982: 980: 969: 961: 957: 953: 947: 943: 936: 897: 784: 780: 776: 772: 768: 764: 760: 756: 752: 748: 744: 740: 736: 734: 648: 640: 638: 629: 625: 623: 556: 552: 548: 544: 540: 536: 534: 446: 441: 437: 432: 427: 423: 419: 418:Given a map 417: 346: 342: 340: 291: 287: 283: 279: 275: 271: 269: 264: 260: 212: 208: 204: 200: 196: 189: 141: 99: 95: 93: 72: 70: 60: 24: 18: 4373:, page 71, 3564:, germs of 3543:phase space 2670:at a point 2626:of a sheaf 2492:The germ of 1794:of a given 751:has domain 743:has domain 444:is written 74:cereal germ 21:mathematics 4565:Categories 4535:PlanetMath 4339:Hugo Rossi 4258:References 4065:satisfies 3624:local ring 1792:presheaves 1734:-algebra. 1730:is also a 941:subvariety 294:such that 57:continuous 4525:EMS Press 4139:⁡ 4126:⋅ 4010:The ring 3981:⋯ 3978:⊊ 3955:− 3949:− 3938:⊊ 3915:− 3904:⊊ 3875:− 3864:⊊ 3861:⋯ 3793:≠ 3762:− 3675:∞ 3382:ω 3354:∞ 3248:⁡ 2998:ω 2936:∞ 2845:for each 2553:∀ 2547:∃ 2511:→ 2363:∞ 2303:ω 2253:⊆ 2233:ω 2173:⊆ 2139:⋂ 2115:∞ 2035:⊆ 1898:⊆ 1855:are both 1564:∩ 1558:⊆ 1515:∈ 1476:∈ 1426:→ 1363:⊆ 1149:manifolds 1085:∩ 917:⊆ 911:∈ 879:∩ 855:∩ 819:∅ 816:≠ 810:∩ 798:∩ 775:if first 694:∼ 678:⟺ 666:∼ 591:→ 505:∼ 498:∣ 492:→ 440:of a set 391:∼ 368:∼ 320:∩ 308:∩ 148:), then 125:→ 37:functions 4571:Topology 4341:(1965). 4282:(1989). 4221:See also 3520:locality 2618:Notation 2487:rational 2479:rational 2469:have an 2215:and the 1989:admit a 1949:If both 1940:defines 1796:presheaf 1738:Examples 1583:with res 1223:presheaf 1137:discrete 1133:topology 632:for any 450:. Thus, 259:for all 49:analytic 4369:(2001) 3593:algebra 3143:is the 3069:is the 3012:is the 2950:is the 2868:is the 2783:is the 2475:regular 2473:, then 2426:subsets 2420:have a 2317:ordinal 1593:) = res 759:, then 144:is any 140:(where 45:subsets 4515:"Germ" 4396:  4380:  4318:  4294:  3576:of an 3077:), or 2383:smooth 2217:subset 2099:subset 2097:, the 1995:subset 1993:, the 1703:limits 1329:(when 1104:is an 787:, say 349:is an 53:smooth 43:) and 31:is an 4543:arXiv 4252:Stalk 4247:Sheaf 3622:is a 3459:is a 3207:is a 3085:) at 2624:stalk 2530:) is 2477:(and 1717:is a 1709:is a 1638:stalk 1333:is a 1112:, or 1026:group 1024:is a 950:, and 900:with 636:map. 79:sheaf 61:local 4394:ISBN 4378:ISBN 4337:and 4316:ISBN 4292:ISBN 3549:and 3524:all 3483:and 3211:and 3081:(in 3073:(in 2622:The 2609:and 2559:> 2350:and 1969:and 1762:and 1504:and 1341:and 1153:jets 1147:are 1143:and 1114:ring 1051:and 1043:and 985:and 779:and 763:and 747:and 274:and 211:and 168:and 67:Name 41:maps 39:(or 25:germ 4533:at 4473:of 4426:di 4136:sgn 3587:in 3245:dim 3147:at 3016:at 2954:at 2892:at 2787:at 2690:of 2443:If 2432:), 2428:of 2394:If 2291:of 2258:Hom 2211:of 2178:Hom 2073:of 2040:Hom 1936:of 1903:Hom 1829:If 1786:to 1742:If 1670:at 1579:of 1352:If 1345:on 1325:on 1317:on 1309:on 1301:on 1293:in 1248:of 1205:at 1127:to 981:If 970:off 946:of 771:in 555:in 547:in 539:in 422:on 345:at 290:of 263:in 199:of 146:set 51:or 19:In 4567:: 4523:, 4517:, 4363:". 4345:. 4330:". 4306:". 4290:. 4217:. 4077:∈ 4069:= 4007:. 3820:0. 3638:. 3614:∈ 3580:. 3553:. 3522:: 2385:, 2381:, 1825:. 1596:WV 1586:WU 1349:. 1321:, 1313:, 1305:, 1213:. 1108:, 1072:fg 1009:. 651:: 382:or 267:. 207:, 4551:. 4545:: 4537:. 4500:) 4486:n 4482:V 4461:P 4439:n 4435:V 4414:P 4402:. 4384:. 4349:. 4324:. 4300:. 4211:m 4207:f 4203:f 4186:, 4181:) 4174:2 4170:/ 4166:1 4161:| 4156:f 4152:| 4148:) 4145:f 4142:( 4131:( 4121:2 4117:/ 4113:1 4108:| 4103:f 4099:| 4095:= 4092:f 4079:m 4075:f 4071:m 4067:m 4063:m 4059:R 4045:) 4041:R 4037:( 4032:0 4027:0 4021:C 4005:m 4001:x 3984:. 3975:) 3972:) 3969:x 3966:( 3963:f 3958:1 3952:j 3945:x 3941:( 3935:) 3932:) 3929:x 3926:( 3923:f 3918:j 3911:x 3907:( 3901:) 3898:) 3895:x 3892:( 3889:f 3884:1 3881:+ 3878:j 3871:x 3867:( 3817:= 3814:x 3809:, 3806:0 3799:, 3796:0 3790:x 3785:, 3778:2 3774:x 3769:/ 3765:1 3758:e 3751:{ 3746:= 3743:) 3740:x 3737:( 3734:f 3717:k 3713:m 3709:m 3702:R 3688:) 3684:R 3680:( 3670:0 3664:C 3628:k 3620:x 3616:X 3612:x 3608:X 3509:. 3497:0 3494:= 3491:x 3467:n 3447:X 3424:V 3417:n 3409:, 3403:O 3396:n 3388:, 3376:C 3368:n 3360:, 3348:C 3340:n 3332:, 3326:k 3320:C 3312:n 3304:, 3298:0 3292:C 3284:n 3257:n 3254:= 3251:X 3225:0 3222:= 3219:x 3195:X 3175:x 3155:x 3129:x 3123:V 3105:. 3093:x 3055:x 3049:O 3036:. 3024:x 2993:x 2987:C 2974:. 2962:x 2931:x 2925:C 2912:. 2900:x 2878:k 2856:k 2831:k 2826:x 2820:C 2807:. 2795:x 2769:0 2764:x 2758:C 2732:. 2727:x 2721:F 2698:X 2678:x 2658:X 2636:F 2613:. 2593:} 2590:) 2587:y 2584:( 2581:g 2578:= 2575:) 2572:y 2569:( 2566:f 2562:x 2556:y 2550:x 2544:: 2541:g 2538:{ 2528:f 2514:Y 2507:R 2503:: 2500:f 2457:Y 2454:, 2451:X 2408:Y 2405:, 2402:X 2359:C 2336:k 2332:C 2275:) 2272:Y 2269:, 2266:X 2263:( 2250:) 2247:Y 2244:, 2241:X 2238:( 2229:C 2195:) 2192:Y 2189:, 2186:X 2183:( 2170:) 2167:Y 2164:, 2161:X 2158:( 2153:k 2149:C 2143:k 2135:= 2132:) 2129:Y 2126:, 2123:X 2120:( 2111:C 2081:k 2057:) 2054:Y 2051:, 2048:X 2045:( 2032:) 2029:Y 2026:, 2023:X 2020:( 2015:k 2011:C 1977:Y 1957:X 1944:. 1920:) 1917:Y 1914:, 1911:X 1908:( 1895:) 1892:Y 1889:, 1886:X 1883:( 1878:0 1874:C 1843:Y 1840:, 1837:X 1807:F 1788:Y 1784:X 1770:Y 1750:X 1732:T 1727:x 1723:F 1719:T 1715:F 1707:T 1684:F 1672:x 1656:x 1650:F 1624:) 1621:W 1618:( 1613:F 1601:g 1599:( 1591:f 1589:( 1581:x 1567:V 1561:U 1555:W 1545:x 1531:) 1528:V 1525:( 1520:F 1512:g 1492:) 1489:U 1486:( 1481:F 1473:f 1463:x 1445:, 1442:) 1439:V 1436:( 1431:F 1423:) 1420:U 1417:( 1412:F 1407:: 1402:U 1399:V 1394:s 1391:e 1388:r 1366:U 1360:V 1347:U 1339:U 1331:X 1327:U 1319:U 1311:U 1303:U 1295:X 1291:U 1277:) 1274:U 1271:( 1266:F 1254:X 1234:F 1207:x 1189:) 1186:Y 1183:, 1180:X 1177:( 1172:k 1167:x 1163:J 1145:Y 1141:X 1129:Y 1125:X 1121:x 1102:Y 1088:V 1082:U 1068:x 1063:x 1058:x 1053:V 1049:U 1045:g 1041:f 1036:x 1031:x 1022:Y 1018:Y 1014:Y 1007:x 991:x 987:g 983:f 962:x 958:x 954:f 948:X 944:V 937:f 920:U 914:V 908:x 898:V 882:V 876:T 871:| 866:g 863:= 858:V 852:S 847:| 842:f 822:, 813:U 807:T 804:= 801:U 795:S 785:x 781:T 777:S 773:X 769:x 765:g 761:f 757:X 753:T 749:g 745:S 741:f 737:X 715:. 710:T 705:1 698:x 688:S 683:1 675:T 670:x 662:S 649:x 641:x 630:f 626:f 609:. 606:) 603:y 600:, 597:Y 594:( 588:) 585:x 582:, 579:X 576:( 573:: 570:f 557:Y 553:y 549:X 545:x 541:X 537:x 520:. 517:} 514:f 509:x 501:g 495:Y 489:X 486:: 483:g 480:{ 477:= 472:x 468:] 464:f 461:[ 447:x 442:S 438:x 433:x 428:x 424:X 420:f 403:. 400:T 395:x 387:S 377:g 372:x 364:f 347:x 326:. 323:U 317:T 314:= 311:U 305:S 292:x 288:U 284:x 280:X 276:T 272:S 265:U 261:u 247:) 244:u 241:( 238:g 235:= 232:) 229:u 226:( 223:f 213:g 209:f 205:U 201:x 197:U 190:x 176:g 156:f 142:Y 128:Y 122:X 119:: 116:g 113:, 110:f 100:X 96:x

Index

mathematics
topological space
equivalence class
functions
maps
subsets
analytic
smooth
continuous
cereal germ
sheaf
set
neighbourhood
equivalence relation
representative
characteristic functions
subvariety
rational function
differentiability
analytic set
group
abelian group
vector space
ring
topology
discrete
manifolds
jets
Taylor series
finite-dimensional vector spaces

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