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Approximately finite-dimensional C*-algebra

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It is clear that the extension of a finite-dimensional C*-algebra by another finite-dimensional C*-algebra is again finite-dimensional. More generally, the extension of an AF algebra by another AF algebra is again AF.
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whose objects are isomorphism classes of finite-dimensional C*-algebras and whose morphisms are *-homomorphisms modulo unitary equivalence. By the above discussion, the objects can be viewed as vectors with entries in
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Lawrence G. Brown. Extensions of AF Algebras: The Projection Lifting Problem. Operator Algebras and Applications, Proceedings of symposia in pure mathematics, vol. 38, Part 1, pp. 175-176, American Mathematical Soc.,
3423: 2144: 2947:. The Effros-Handelman-Shen theorem says the converse is true. Every Riesz group, with a given scale, arises as the dimension group of some AF algebra. This specifies the range of the classifying functor 2016: 4771: 604: 790: 4648: 4000: 3111:
is given entrywise order. The two properties of Riesz groups are preserved by direct limits, assuming the order structure on the direct limit comes from those in the inductive system. So (
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is one with a separable predual and contains a weakly dense AF C*-algebra. Murray and von Neumann showed that, up to isomorphism, there exists a unique hyperfinite type II
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Two preliminary facts are needed before one can sketch a proof of Elliott's theorem. The first one summarizes the above discussion on finite-dimensional C*-algebras.
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exhibited a family of non-isomorphic type III hyperfinite factors with cardinality of the continuum. Today we have a complete classification of hyperfinite factors.
1327: 102:. For unital AF algebras, both existence and uniqueness follow from the fact the Murray-von Neumann semigroup of projections in an AF algebra is cancellative. 76: 3221: 331: 1520: 3615: 3599:{\displaystyle (G,G^{+})=\varinjlim (H_{k},H_{k}^{+}),\quad {\mbox{where}}\quad (H,H_{k}^{+})=(\mathbb {Z} ^{n_{k}},\mathbb {Z} _{+}^{n_{k}}).} 730:
is unital. The inductive system specifying an AF algebra is not unique. One can always drop to a subsequence. Suppressing the connecting maps,
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if it is scale-preserving. Two dimension group are said to be isomorphic if there exists a contractive group isomorphism between them.
4271:, in a sense appropriate for ordered groups. Thus UHF algebras are simple C*-algebras. In general, the groups which are not dense in 2048: 937:
Due to the presence of matrix units in the inductive sequence, AF algebras have the following local characterization: a C*-algebra
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We sketch the proof for the non-trivial part of the theorem, corresponding to the sequence of commutative diagrams on the right.
4733: 2665:. Given an isomorphism between dimension groups, one constructs a diagram of commuting triangles between the direct systems of 816:, with the nodes connected by appropriate downward arrows, is the Bratteli diagram of an AF algebra. A Bratteli diagram of the 4324:
It was proposed by Elliott that other classes of C*-algebras may be classifiable by K-theoretic invariants. For a C*-algebra
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In the literature, one can find several conjectures of this kind with corresponding modified/refined Elliott invariants.
695:{\displaystyle A=\varinjlim \cdots \rightarrow A_{i}\,{\stackrel {\alpha _{i}}{\rightarrow }}A_{i+1}\rightarrow \cdots ,} 3136:'s, each with the canonical order structure. This hinges on the following technical lemma, sometimes referred to as the 4664: 4784: 740: 3938: 1450: 451: 98:: the lift must be unique up to approximate unitary equivalence. Classification then follows from what is known as 820:
is given on the right. The two arrows between nodes means each connecting map is an embedding of multiplicity 2.
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A key step towards the Effros-Handelman-Shen theorem is the fact that every Riesz group is the direct limit of
1184:{\displaystyle M_{\infty }(A)=\varinjlim \cdots \rightarrow M_{n}(A)\rightarrow M_{n+1}(A)\rightarrow \cdots .} 325:
is said to be the multiplicity of Φ. In general, a unital homomorphism between finite-dimensional C*-algebras
258: 4831: 4157: 173: 4011: 4826: 3876: 1262:). It is clear that ~ is an equivalence relation. Define a binary operation + on the set of equivalences 1195: 2327:
Elliott's theorem says that the dimension group is a complete invariant of AF algebras: two AF algebras
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by Elliott stated that the Elliott invariant classifies simple unital separable amenable C*-algebras.
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where all the connecting homomorphisms in the directed system on the right hand side are positive.
860:{\displaystyle 1\rightrightarrows 2\rightrightarrows 4\rightrightarrows 8\rightrightarrows \dots } 43:
C*-algebras. Approximate finite-dimensionality was first defined and described combinatorially by
4499:{\displaystyle {\mbox{Ell}}(A)=((K_{0}(A),K_{0}(A)^{+},\Gamma (A)),K_{1}(A),T^{+}(A),\rho _{A}),} 2852:
By induction, we have a diagram of commuting triangles as indicated in the last diagram. The map
125: 121: 94:: a homomorphism between invariants must lift to a *-homomorphism of algebras. Second, one shows 4821: 4772:
On the Classification of Inductive Limits of Sequences of Semisimple Finite-Dimensional Algebras
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with a unitary conjugation if needed, we have a commutative triangle on the level of algebras.
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can be "moved back", on the level of algebras, to some finite stage in the inductive system.
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further down if necessary, we obtain diagram 4, a commutative triangle on the level of
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for AF-algebras serves as a prototype for classification results for larger classes of
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Regularity properties in the classification program for separable amenable C-algebras
3321:{\displaystyle (G,G^{+})=\varinjlim (\mathbb {Z} ^{n_{k}},\mathbb {Z} _{+}^{n_{k}}),} 3086:) is an ordered group that is unperforated and has the Riesz decomposition property. 993: 518:
In the non-unital case, the equality is replaced by ≤. Graphically, Φ, equivalently (
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stably finite C*-algebras. Its proof divides into two parts. The invariant here is
411:{\displaystyle \Phi :\oplus _{1}^{s}M_{n_{k}}\rightarrow \oplus _{1}^{t}M_{m_{l}}} 4253: 4101:
A similar argument applies in general. Observe that the scale is by definition a
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are both finite-dimensional, corresponding to each partial multiplicities matrix
1074:) canonically, into the "upper left corner". Consider the algebraic direct limit 813: 70: 32: 1625:{\displaystyle (K_{0}(A),K_{0}(A)^{+})=(\mathbb {Z} ^{m},\mathbb {Z} _{+}^{m}).} 1344:. While we could choose matrices of arbitrarily large dimension to stand in for 532: 73: 4842: 3713:{\displaystyle \Gamma (H_{1})=\{v\in H_{1}^{+}|\phi _{1}(v)\in \Gamma (G)\},} 2967: 2944: 2835:
For finite-dimensional algebras, two *-homomorphisms induces the same map on
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A finer invariant is needed to detect isomorphism classes. For an AF algebra
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and serves as the range of a kind of "dimension function." For an AF algebra
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is the tracial positive linear functionals in the weak-* topology, and
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are isomorphic if and only if their dimension groups are isomorphic.
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between AF algebras in fact induces a contractive group homomorphism
1919:), to be the subset whose elements are represented by projections in 1361: 36: 1661: 87: 949:
is "almost contained" in some finite-dimensional C*-subalgebra.
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are AF and unital. Their dimension groups are the subgroups of
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The proof of the lemma is based on the simple observation that
2250:, there is a unique, up to unitary equivalence, *-homomorphism 2139:{\displaystyle \Gamma (A)=\{x\in K_{0}(A)\,|\,0\leq x\leq \}.} 2842:
if and only if they are unitary equivalent. So, by composing
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can be identified with the partial multiplicities matrix of
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Up to unitary equivalence, a unital *-homomorphism Φ :
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world are the hyperfinite factors, which were classified by
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A group homomorphism between dimension group is said to be
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is a finite-dimensional C*-algebra and the connecting maps
3783:'s (with the number of copies possible less than that in 2208:
The dimension group retains the essential properties of
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gave a complete classification of AF algebras using the
3143: 2011:{\displaystyle \Gamma (A)=\{\,|\,p^{*}=p^{2}=p\in A\}.} 1411:
is Murray-von Neumann equivalent to a subprojection of
1352:, our result will be equivalent regardless. This makes 128:, AF C*-algebras are noncommutative generalizations of 4343: 3504: 3193:, as indicated in the adjacent diagram, such that ker( 2606:
are isomorphic if and only if their dimension groups (
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is an invariant of C*-algebras. It has its origins in
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Commutative C*-algebras, which were characterized by
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is itself an AF algebra. Given a Bratteli diagram of
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and morphisms are the partial multiplicity matrices.
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of two finite-dimensional matrices corresponding to
4319: 1407:) carries a natural order structure: we say ≤ if 4734:Inductive limits of finite dimensional C*-algebras 4636: 4600: 4564: 4537: 4498: 4087: 3994: 3914: 3712: 3598: 3320: 2954:for AF-algebras and completes the classification. 2818:Using the property of the direct limit and moving 2805:Φ shows that the second diagram commutes for some 2795:such that the first diagram on the right commutes. 2138: 2010: 1624: 1503: 1321: 1183: 930:gives inductive system that specifies an ideal of 859: 784: 694: 507: 410: 298: 209: 153: 4760:Dimension groups and their affine representations 4148:. The same argument as above proves the theorem. 1676:between AF algebras induces a group homomorphism 1444:For example, for a finite-dimensional C*-algebra 598:of a sequence of finite-dimensional C*-algebras: 158: 4840: 105:The counterpart of simple AF C*-algebras in the 25:approximately finite-dimensional (AF) C*-algebra 4185:) is the group of rational numbers of the form 785:{\displaystyle A={\overline {\cup _{n}A_{n}}}.} 3790:). So this gives a finite-dimensional algebra 1383:construction gives an abelian group, which is 1198:(self-adjoint idempotents) in this algebra by 723:are *-homomorphisms. We will assume that each 421:is specified, up to unitary equivalence, by a 3995:{\displaystyle \varinjlim (G_{k},G_{k}^{+}),} 1504:{\displaystyle A=\oplus _{k=1}^{m}M_{n_{k}},} 508:{\displaystyle \sum _{k}r_{lk}n_{k}=m_{l}.\;} 167:takes the following form, up to isomorphism: 3704: 3641: 3609:Dropping to a subsequence if necessary, let 2408:The lemma can be extended to the case where 2130: 2067: 2002: 1948: 86:with its natural order structure; this is a 2924:, the adjacent diagram commutates for each 2815:Comparing diagrams 1 and 2 gives diagram 3. 2323:Commutative diagrams for Elliott's theorem. 934:. In fact, every ideal arises in this way. 163:An arbitrary finite-dimensional C*-algebra 3350:) is a countable Riesz group with scale Γ( 2943:The dimension group of an AF algebra is a 2661:The crux of the proof has become known as 2471:. Then for any a contractive homomorphism 1861:are not isomorphic but stably isomorphic; 504: 4806:, Encyclopaedia of Mathematical Sciences 4758:, Handelman, D.E., and Shen C.L. (1980), 3852:. There is a corresponding homomorphism 3568: 3546: 3290: 3268: 2928:. By uniqueness of direct limit of maps, 2101: 2095: 1966: 1960: 1601: 1586: 643: 4684:obtained the analogous result for the II 3845:determines a finite-dimensional algebra 3406:Consider first the special case where Γ( 3142: 2909: 2318: 812:} in the obvious way. For instance, the 299:{\displaystyle \Phi (a)=a\otimes I_{r},} 62:with sufficiently nice order structure. 4657: 2767:). By the previous lemma, there exists 2531:is unique up to unitary equivalence in 2344:For two finite-dimensional C*-algebras 1843:can only distinguish AF algebras up to 1043:matrices whose entries are elements of 869:(A Bratteli diagram of the CAR algebra) 805:is formed by the Bratteli diagrams of { 4841: 4164:. For example, for the 2 × 2 matrices 1802: 1635:Two essential features of the mapping 945:is separable and any finite subset of 926:of nodes, the subdiagram generated by 4804:Classification of Nuclear C*-Algebras 4782:Elliott, G.A. and Toms, A.S. (2008), 4267:) ∩ , with 1 = . All such groups are 3215:) can be expressed as a direct limit 3125:) is a Riesz group for an AF algebra 3009:The following property is called the 2883:is the direct limit of the sequence { 2864:is the direct limit of the sequence { 2731:)) be a dimension group isomorphism. 2405:is unique up to unitary equivalence. 2038:element is the maximal element of Γ( 210:{\displaystyle \oplus _{k}M_{n_{k}},} 4797:A User's Guide for Operator Algebras 4088:{\displaystyle \cup _{k}\phi _{k}=.} 3870:. Induction gives a directed system 2314: 3915:{\displaystyle A=\varinjlim A_{k},} 3772:has the canonical order structure, 3354:), then there exists an AF algebra 2735:Consider the composition of maps Φ 2549:) is finitely generated and, since 227:denotes the full matrix algebra of 13: 4418: 3692: 3619: 2966:with a partial order is called an 2052: 1933: 1089: 335: 262: 14: 4860: 4814: 2939:The Effros-Handelman-Shen theorem 2497:), there exists a *-homomorphism 2460:be the canonical homomorphism of 2378:), there exists a *-homomorphism 2352:, and a contractive homomorphism 1022:) can be defined as follows. Let 979: 535:with nodes corresponding to each 4752:, American Mathematical Society. 4665:approximately finite-dimensional 4320:Elliott's classification program 2898:are mutual inverses. Therefore, 2303:is the direct limit of those of 58:functor whose range consists of 4572:is the natural pairing between 3751:. Now consider the order ideal 3510: 3502: 2957: 2663:Elliott's intertwining argument 2299:), then the dimension group of 154:Definition and basic properties 4712: 4702: 4631: 4625: 4595: 4589: 4532: 4526: 4490: 4474: 4468: 4452: 4446: 4430: 4427: 4421: 4406: 4399: 4383: 4377: 4364: 4361: 4355: 4349: 4158:uniformly hyperfinite algebras 4098:This proves the special case. 4079: 4060: 4054: 4035: 3986: 3955: 3701: 3695: 3686: 3680: 3666: 3635: 3622: 3590: 3541: 3535: 3511: 3496: 3465: 3446: 3427: 3334: 3312: 3263: 3244: 3225: 2974:of elements ≥ 0 is called the 2673:by applying the second lemma. 2238:on the dimension groups. When 2127: 2114: 2097: 2092: 2086: 2061: 2055: 1962: 1957: 1951: 1942: 1936: 1616: 1581: 1575: 1566: 1559: 1543: 1537: 1524: 1368:. We denote this semigroup by 1316: 1304: 1298: 1292: 1286: 1280: 1172: 1169: 1163: 1144: 1141: 1135: 1122: 1100: 1094: 851: 845: 839: 833: 683: 648: 630: 585: 549:and the number of arrows from 373: 271: 265: 159:Finite-dimensional C*-algebras 1: 4748:, Field Institute Monographs 4725: 2917:Furthermore, on the level of 1713:are both finite-dimensional, 1217:Murray-von Neumann equivalent 527:), can be represented by its 4293:, are AF precisely when the 4275:are the dimension groups of 3011:Riesz decomposition property 774: 563:is the partial multiplicity 531:. The Bratteli diagram is a 7: 4827:Encyclopedia of Mathematics 4301:. The continuous functions 4151: 1733:respects direct limits. If 252:is necessarily of the form 10: 4865: 4737:, Trans. Amer. Math. Soc. 3797:whose dimension group is ( 3410:) = with maximal element 3392:) = with maximal element 3107:) is a Riesz group, where 2433:be finite-dimensional and 2186:, its dimension group is ( 4788:, Bull. Amer. Math. Soc. 4662:In a related context, an 4565:{\displaystyle \rho _{A}} 2798:Same argument applied to 100:the intertwining argument 4695: 4637:{\displaystyle K_{0}(A)} 4601:{\displaystyle T^{+}(A)} 4538:{\displaystyle T^{+}(A)} 3388:)). In particular, if Γ( 3093:is finite-dimensional, ( 2556:respects direct limits, 4744:Davidson, K.R. (1996), 4731:Bratteli, Ola. (1972), 1767:) is the direct limit ∪ 1705:). In particular, when 1430:whose positive cone is 1060:) can be embedded into 1035:) be the C*-algebra of 734:can also be written as 122:noncommutative geometry 4795:Fillmore, P.A.(1996), 4769:Elliott, G.A. (1976), 4746:C*-algebras by Example 4638: 4602: 4566: 4539: 4500: 4089: 3996: 3916: 3714: 3600: 3322: 3148: 2914: 2324: 2140: 2012: 1626: 1505: 1323: 1185: 861: 786: 696: 509: 442:) satisfying, for all 431:partial multiplicities 412: 300: 211: 67:classification theorem 60:ordered abelian groups 4799:, Wiley-Interscience. 4718:Davidson 1996, p. 77. 4639: 4603: 4567: 4540: 4501: 4316:is one such example. 4090: 3997: 3917: 3715: 3601: 3323: 3146: 2913: 2774:and a *-homomorphism 2322: 2141: 2025:is unital with unit 1 2013: 1825:)) is isomorphic to 1627: 1506: 1366:cancellation property 1334:orthogonal direct sum 1324: 1186: 984: 941:is AF if and only if 862: 787: 697: 510: 413: 301: 212: 4658:Von Neumann algebras 4612: 4576: 4549: 4513: 4339: 4299:totally disconnected 4012: 3939: 3877: 3817:forward by defining 3616: 3424: 3403:is unital with = . 3222: 3162:) be a Riesz group, 3089:It is clear that if 3035:, then there exists 2890:}. It is clear that 2049: 1930: 1664:. A *-homomorphism 1521: 1451: 1277: 1081: 1005:topological K-theory 952:The projections in ∪ 827: 741: 605: 452: 332: 259: 174: 145:totally disconnected 90:. First, one proves 4802:Rørdam, M. (2002), 4674:von Neumann algebra 3985: 3779:is a direct sum of 3664: 3589: 3534: 3495: 3311: 3207:Every Riesz group ( 3147:The Shen criterion. 3140:in the literature. 2986:is unperforated if 2658:)) are isomorphic. 1803:The dimension group 1615: 1480: 1332:where ⊕ yields the 390: 355: 107:von Neumann algebra 4810:, Springer-Verlag. 4634: 4598: 4562: 4535: 4496: 4347: 4252:) is the group of 4116:}, one can choose 4085: 3992: 3971: 3950: 3912: 3894: 3710: 3650: 3596: 3566: 3520: 3508: 3481: 3460: 3318: 3288: 3258: 3149: 2915: 2325: 2219:A *-homomorphism 2136: 2008: 1845:stable isomorphism 1622: 1599: 1501: 1460: 1381:Grothendieck group 1379:). Performing the 1322:{\displaystyle +=} 1319: 1181: 1114: 914:). In particular, 857: 782: 692: 622: 505: 464: 408: 376: 341: 296: 207: 120:In the context of 41:finite-dimensional 4762:, Amer. J. Math. 4346: 4332:is defined to be 4330:Elliott invariant 4211:. The scale is Γ( 3943: 3887: 3744:for some element 3507: 3453: 3251: 2596:Theorem (Elliott) 2315:Elliott's theorem 2167:)) is called the 1660:is a (covariant) 1107: 897:takes the form ∪ 889:), then an ideal 873:If an AF algebra 777: 664: 615: 455: 49:George A. Elliott 4856: 4835: 4719: 4716: 4710: 4706: 4643: 4641: 4640: 4635: 4624: 4623: 4607: 4605: 4604: 4599: 4588: 4587: 4571: 4569: 4568: 4563: 4561: 4560: 4544: 4542: 4541: 4536: 4525: 4524: 4505: 4503: 4502: 4497: 4489: 4488: 4467: 4466: 4445: 4444: 4414: 4413: 4398: 4397: 4376: 4375: 4348: 4344: 4254:dyadic rationals 4233: 4231: 4230: 4227: 4224: 4202: 4200: 4199: 4196: 4193: 4094: 4092: 4091: 4086: 4078: 4077: 4053: 4052: 4034: 4033: 4024: 4023: 4001: 3999: 3998: 3993: 3984: 3979: 3967: 3966: 3951: 3921: 3919: 3918: 3913: 3908: 3907: 3895: 3719: 3717: 3716: 3711: 3679: 3678: 3669: 3663: 3658: 3634: 3633: 3605: 3603: 3602: 3597: 3588: 3587: 3586: 3576: 3571: 3562: 3561: 3560: 3559: 3549: 3533: 3528: 3509: 3505: 3494: 3489: 3477: 3476: 3461: 3445: 3444: 3327: 3325: 3324: 3319: 3310: 3309: 3308: 3298: 3293: 3284: 3283: 3282: 3281: 3271: 3259: 3243: 3242: 2982:. One says that 2598:Two AF algebras 2416:on the level of 2145: 2143: 2142: 2137: 2126: 2125: 2100: 2085: 2084: 2017: 2015: 2014: 2009: 1989: 1988: 1976: 1975: 1965: 1915:), denoted by Γ( 1900:, we define the 1631: 1629: 1628: 1623: 1614: 1609: 1604: 1595: 1594: 1589: 1574: 1573: 1558: 1557: 1536: 1535: 1510: 1508: 1507: 1502: 1497: 1496: 1495: 1494: 1479: 1474: 1328: 1326: 1325: 1320: 1246:partial isometry 1206:). Two elements 1190: 1188: 1187: 1182: 1162: 1161: 1134: 1133: 1115: 1093: 1092: 966:approximate unit 964:in fact form an 922:and some subset 866: 864: 863: 858: 798:Bratteli diagram 791: 789: 788: 783: 778: 773: 772: 771: 762: 761: 751: 701: 699: 698: 693: 682: 681: 666: 665: 663: 662: 661: 651: 646: 642: 641: 623: 590:A C*-algebra is 529:Bratteli diagram 514: 512: 511: 506: 500: 499: 487: 486: 477: 476: 463: 417: 415: 414: 409: 407: 406: 405: 404: 389: 384: 372: 371: 370: 369: 354: 349: 305: 303: 302: 297: 292: 291: 216: 214: 213: 208: 203: 202: 201: 200: 186: 185: 4864: 4863: 4859: 4858: 4857: 4855: 4854: 4853: 4839: 4838: 4820: 4817: 4728: 4723: 4722: 4717: 4713: 4707: 4703: 4698: 4687: 4679: 4660: 4619: 4615: 4613: 4610: 4609: 4583: 4579: 4577: 4574: 4573: 4556: 4552: 4550: 4547: 4546: 4520: 4516: 4514: 4511: 4510: 4484: 4480: 4462: 4458: 4440: 4436: 4409: 4405: 4393: 4389: 4371: 4367: 4342: 4340: 4337: 4336: 4322: 4280: 4262: 4247: 4228: 4225: 4222: 4221: 4219: 4217: 4197: 4194: 4189: 4188: 4186: 4184: 4177: 4170: 4156:By definition, 4154: 4146: 4140: 4132: 4121: 4114: 4073: 4069: 4048: 4044: 4029: 4025: 4019: 4015: 4013: 4010: 4009: 3980: 3975: 3962: 3958: 3942: 3940: 3937: 3936: 3931: 3903: 3899: 3886: 3878: 3875: 3874: 3869: 3865: 3858: 3851: 3844: 3837: 3830: 3823: 3816: 3810:, ). Next move 3809: 3803: 3796: 3789: 3778: 3771: 3765:. Because each 3764: 3757: 3750: 3742: 3736: 3729: 3674: 3670: 3665: 3659: 3654: 3629: 3625: 3617: 3614: 3613: 3582: 3578: 3577: 3572: 3567: 3555: 3551: 3550: 3545: 3544: 3529: 3524: 3503: 3490: 3485: 3472: 3468: 3452: 3440: 3436: 3425: 3422: 3421: 3415: 3397: 3371: 3364: 3337: 3304: 3300: 3299: 3294: 3289: 3277: 3273: 3272: 3267: 3266: 3250: 3238: 3234: 3223: 3220: 3219: 3176: 3124: 3117: 3106: 3099: 3065: 3058: 3051: 3040: 3033: 3022: 2960: 2953: 2941: 2934: 2923: 2906:are isomorphic. 2888: 2869: 2848: 2841: 2831: 2824: 2811: 2804: 2794: 2787: 2780: 2773: 2762: 2755: 2748: 2741: 2722: 2711: 2696: 2685: 2649: 2638: 2623: 2612: 2590: 2584: 2577: 2572: 2562: 2555: 2544: 2522: 2517: 2510: 2492: 2481: 2465: 2458: 2451: 2446: 2422: 2396: 2373: 2362: 2317: 2308: 2297: 2290: 2285: 2268: 2237: 2214: 2184: 2169:dimension group 2162: 2155: 2121: 2117: 2096: 2080: 2076: 2050: 2047: 2046: 2042:) and in fact, 2037: 2030: 1984: 1980: 1971: 1967: 1961: 1931: 1928: 1927: 1910: 1888: 1881: 1874: 1867: 1860: 1853: 1847:. For example, 1842: 1831: 1820: 1813: 1805: 1797: 1788: 1781: 1772: 1762: 1754: 1747: 1742: 1732: 1719: 1700: 1689: 1682: 1659: 1645: 1610: 1605: 1600: 1590: 1585: 1584: 1569: 1565: 1553: 1549: 1531: 1527: 1522: 1519: 1518: 1490: 1486: 1485: 1481: 1475: 1464: 1452: 1449: 1448: 1435: 1420: 1401: 1388: 1373: 1278: 1275: 1274: 1257: 1214:are said to be 1151: 1147: 1129: 1125: 1106: 1088: 1084: 1082: 1079: 1078: 1069: 1055: 1030: 1017: 1001: 990: 988: 982: 962: 957: 912: 902: 887: 882: 828: 825: 824: 814:Pascal triangle 810: 767: 763: 757: 753: 752: 750: 742: 739: 738: 728: 722: 713: 671: 667: 657: 653: 652: 647: 645: 644: 637: 633: 614: 606: 603: 602: 588: 568: 561: 554: 547: 540: 526: 495: 491: 482: 478: 469: 465: 459: 453: 450: 449: 441: 400: 396: 395: 391: 385: 380: 365: 361: 360: 356: 350: 345: 333: 330: 329: 287: 283: 260: 257: 256: 250: 243: 225: 196: 192: 191: 187: 181: 177: 175: 172: 171: 161: 156: 134: 85: 57: 33:inductive limit 17: 12: 11: 5: 4862: 4852: 4851: 4837: 4836: 4816: 4815:External links 4813: 4812: 4811: 4800: 4793: 4780: 4767: 4753: 4742: 4727: 4724: 4721: 4720: 4711: 4700: 4699: 4697: 4694: 4685: 4677: 4659: 4656: 4633: 4630: 4627: 4622: 4618: 4597: 4594: 4591: 4586: 4582: 4559: 4555: 4534: 4531: 4528: 4523: 4519: 4507: 4506: 4495: 4492: 4487: 4483: 4479: 4476: 4473: 4470: 4465: 4461: 4457: 4454: 4451: 4448: 4443: 4439: 4435: 4432: 4429: 4426: 4423: 4420: 4417: 4412: 4408: 4404: 4401: 4396: 4392: 4388: 4385: 4382: 4379: 4374: 4370: 4366: 4363: 4360: 4357: 4354: 4351: 4321: 4318: 4278: 4260: 4245: 4234:, 1}. For the 4215: 4182: 4175: 4168: 4153: 4150: 4144: 4138: 4130: 4119: 4112: 4096: 4095: 4084: 4081: 4076: 4072: 4068: 4065: 4062: 4059: 4056: 4051: 4047: 4043: 4040: 4037: 4032: 4028: 4022: 4018: 4003: 4002: 3991: 3988: 3983: 3978: 3974: 3970: 3965: 3961: 3957: 3954: 3949: 3946: 3929: 3923: 3922: 3911: 3906: 3902: 3898: 3893: 3890: 3885: 3882: 3867: 3863: 3856: 3849: 3842: 3835: 3828: 3821: 3814: 3807: 3801: 3794: 3787: 3776: 3769: 3762: 3755: 3748: 3740: 3734: 3727: 3721: 3720: 3709: 3706: 3703: 3700: 3697: 3694: 3691: 3688: 3685: 3682: 3677: 3673: 3668: 3662: 3657: 3653: 3649: 3646: 3643: 3640: 3637: 3632: 3628: 3624: 3621: 3607: 3606: 3595: 3592: 3585: 3581: 3575: 3570: 3565: 3558: 3554: 3548: 3543: 3540: 3537: 3532: 3527: 3523: 3519: 3516: 3513: 3501: 3498: 3493: 3488: 3484: 3480: 3475: 3471: 3467: 3464: 3459: 3456: 3451: 3448: 3443: 3439: 3435: 3432: 3429: 3413: 3395: 3369: 3362: 3336: 3333: 3329: 3328: 3317: 3314: 3307: 3303: 3297: 3292: 3287: 3280: 3276: 3270: 3265: 3262: 3257: 3254: 3249: 3246: 3241: 3237: 3233: 3230: 3227: 3174: 3138:Shen criterion 3122: 3115: 3104: 3097: 3063: 3056: 3049: 3042:≥ 0 such that 3038: 3031: 3020: 2959: 2956: 2951: 2940: 2937: 2932: 2921: 2908: 2907: 2886: 2867: 2850: 2846: 2839: 2833: 2829: 2822: 2816: 2813: 2809: 2802: 2796: 2792: 2785: 2778: 2771: 2760: 2753: 2746: 2739: 2720: 2709: 2694: 2683: 2647: 2636: 2621: 2610: 2588: 2582: 2575: 2568: 2560: 2553: 2542: 2520: 2515: 2508: 2490: 2479: 2463: 2456: 2449: 2442: 2420: 2394: 2371: 2360: 2316: 2313: 2312: 2311: 2306: 2295: 2288: 2281: 2274: 2266: 2235: 2212: 2182: 2160: 2153: 2147: 2146: 2135: 2132: 2129: 2124: 2120: 2116: 2113: 2110: 2107: 2104: 2099: 2094: 2091: 2088: 2083: 2079: 2075: 2072: 2069: 2066: 2063: 2060: 2057: 2054: 2035: 2026: 2019: 2018: 2007: 2004: 2001: 1998: 1995: 1992: 1987: 1983: 1979: 1974: 1970: 1964: 1959: 1956: 1953: 1950: 1947: 1944: 1941: 1938: 1935: 1908: 1886: 1879: 1872: 1865: 1858: 1851: 1840: 1829: 1818: 1811: 1804: 1801: 1800: 1799: 1793: 1786: 1776: 1768: 1760: 1752: 1745: 1738: 1730: 1725: 1717: 1698: 1687: 1680: 1657: 1643: 1633: 1632: 1621: 1618: 1613: 1608: 1603: 1598: 1593: 1588: 1583: 1580: 1577: 1572: 1568: 1564: 1561: 1556: 1552: 1548: 1545: 1542: 1539: 1534: 1530: 1526: 1512: 1511: 1500: 1493: 1489: 1484: 1478: 1473: 1470: 1467: 1463: 1459: 1456: 1433: 1418: 1399: 1386: 1371: 1330: 1329: 1318: 1315: 1312: 1309: 1306: 1303: 1300: 1297: 1294: 1291: 1288: 1285: 1282: 1255: 1192: 1191: 1180: 1177: 1174: 1171: 1168: 1165: 1160: 1157: 1154: 1150: 1146: 1143: 1140: 1137: 1132: 1128: 1124: 1121: 1118: 1113: 1110: 1105: 1102: 1099: 1096: 1091: 1087: 1064: 1051: 1026: 1015: 999: 989: 986: 983: 981: 980:Classification 978: 960: 953: 910: 898: 885: 878: 871: 870: 867: 856: 853: 850: 847: 844: 841: 838: 835: 832: 808: 793: 792: 781: 776: 770: 766: 760: 756: 749: 746: 726: 718: 709: 703: 702: 691: 688: 685: 680: 677: 674: 670: 660: 656: 650: 640: 636: 632: 629: 626: 621: 618: 613: 610: 587: 584: 566: 559: 552: 545: 538: 533:directed graph 522: 516: 515: 503: 498: 494: 490: 485: 481: 475: 472: 468: 462: 458: 437: 419: 418: 403: 399: 394: 388: 383: 379: 375: 368: 364: 359: 353: 348: 344: 340: 337: 307: 306: 295: 290: 286: 282: 279: 276: 273: 270: 267: 264: 248: 241: 223: 218: 217: 206: 199: 195: 190: 184: 180: 160: 157: 155: 152: 132: 83: 55: 15: 9: 6: 4: 3: 2: 4861: 4850: 4847: 4846: 4844: 4833: 4829: 4828: 4823: 4819: 4818: 4809: 4805: 4801: 4798: 4794: 4791: 4787: 4786: 4781: 4778: 4775:, J. Algebra 4774: 4773: 4768: 4765: 4761: 4757: 4754: 4751: 4747: 4743: 4740: 4736: 4735: 4730: 4729: 4715: 4705: 4701: 4693: 4691: 4683: 4675: 4671: 4667: 4666: 4655: 4652: 4650: 4647:The original 4645: 4628: 4620: 4616: 4592: 4584: 4580: 4557: 4553: 4529: 4521: 4517: 4493: 4485: 4481: 4477: 4471: 4463: 4459: 4455: 4449: 4441: 4437: 4433: 4424: 4415: 4410: 4402: 4394: 4390: 4386: 4380: 4372: 4368: 4358: 4352: 4335: 4334: 4333: 4331: 4327: 4317: 4315: 4312: 4308: 4304: 4300: 4296: 4292: 4287: 4285: 4281: 4274: 4270: 4266: 4259: 4255: 4251: 4244: 4240: 4237: 4214: 4210: 4206: 4192: 4181: 4174: 4167: 4163: 4159: 4149: 4147: 4137: 4133: 4126: 4122: 4115: 4108: 4104: 4099: 4082: 4074: 4070: 4066: 4063: 4057: 4049: 4045: 4041: 4038: 4030: 4026: 4020: 4016: 4008: 4007: 4006: 3989: 3981: 3976: 3972: 3968: 3963: 3959: 3952: 3947: 3944: 3935: 3934: 3933: 3928: 3909: 3904: 3900: 3896: 3891: 3888: 3883: 3880: 3873: 3872: 3871: 3862: 3855: 3848: 3841: 3834: 3827: 3820: 3813: 3806: 3800: 3793: 3786: 3782: 3775: 3768: 3761: 3758:generated by 3754: 3747: 3743: 3733: 3726: 3707: 3698: 3689: 3683: 3675: 3671: 3660: 3655: 3651: 3647: 3644: 3638: 3630: 3626: 3612: 3611: 3610: 3593: 3583: 3579: 3573: 3563: 3556: 3552: 3538: 3530: 3525: 3521: 3517: 3514: 3499: 3491: 3486: 3482: 3478: 3473: 3469: 3462: 3457: 3454: 3449: 3441: 3437: 3433: 3430: 3420: 3419: 3418: 3416: 3409: 3404: 3402: 3398: 3391: 3387: 3383: 3379: 3375: 3368: 3361: 3357: 3353: 3349: 3345: 3341: 3332: 3315: 3305: 3301: 3295: 3285: 3278: 3274: 3260: 3255: 3252: 3247: 3239: 3235: 3231: 3228: 3218: 3217: 3216: 3214: 3210: 3206: 3202: 3200: 3196: 3192: 3188: 3184: 3180: 3173: 3169: 3165: 3161: 3157: 3153: 3145: 3141: 3139: 3135: 3130: 3128: 3121: 3114: 3110: 3103: 3096: 3092: 3087: 3085: 3081: 3077: 3072: 3070: 3066: 3059: 3052: 3045: 3041: 3034: 3027: 3023: 3016: 3012: 3007: 3005: 3001: 2997: 2993: 2989: 2985: 2981: 2977: 2976:positive cone 2973: 2969: 2968:ordered group 2965: 2955: 2950: 2946: 2936: 2931: 2927: 2920: 2912: 2905: 2901: 2897: 2893: 2889: 2882: 2878: 2874: 2870: 2863: 2859: 2855: 2851: 2845: 2838: 2834: 2828: 2821: 2817: 2814: 2808: 2801: 2797: 2791: 2784: 2777: 2770: 2766: 2759: 2752: 2745: 2738: 2734: 2733: 2732: 2730: 2726: 2719: 2715: 2708: 2704: 2700: 2693: 2689: 2682: 2677: 2674: 2672: 2668: 2664: 2659: 2657: 2653: 2646: 2642: 2635: 2631: 2627: 2620: 2616: 2609: 2605: 2601: 2597: 2593: 2591: 2581: 2578: 2571: 2566: 2559: 2552: 2548: 2541: 2536: 2534: 2530: 2526: 2519: 2511: 2504: 2500: 2496: 2489: 2485: 2478: 2474: 2470: 2466: 2459: 2452: 2445: 2440: 2436: 2432: 2428: 2424: 2419: 2415: 2412:is AF. A map 2411: 2406: 2404: 2400: 2393: 2389: 2385: 2381: 2377: 2370: 2366: 2359: 2355: 2351: 2347: 2343: 2339: 2336: 2334: 2330: 2321: 2309: 2302: 2298: 2291: 2284: 2279: 2275: 2272: 2265: 2261: 2257: 2253: 2249: 2245: 2241: 2234: 2230: 2226: 2222: 2218: 2217: 2216: 2211: 2206: 2204: 2199: 2197: 2194:, {1, 2,..., 2193: 2189: 2185: 2178: 2174: 2170: 2166: 2159: 2152: 2133: 2122: 2118: 2111: 2108: 2105: 2102: 2089: 2081: 2077: 2073: 2070: 2064: 2058: 2045: 2044: 2043: 2041: 2034: 2029: 2024: 2005: 1999: 1996: 1993: 1990: 1985: 1981: 1977: 1972: 1968: 1954: 1945: 1939: 1926: 1925: 1924: 1922: 1918: 1914: 1907: 1903: 1899: 1894: 1892: 1885: 1878: 1871: 1864: 1857: 1850: 1846: 1839: 1835: 1828: 1824: 1817: 1810: 1796: 1792: 1785: 1779: 1775: 1771: 1766: 1759: 1755: 1748: 1741: 1736: 1729: 1726: 1723: 1716: 1712: 1708: 1704: 1697: 1693: 1686: 1679: 1675: 1671: 1667: 1663: 1656: 1653: 1652: 1651: 1649: 1642: 1638: 1619: 1611: 1606: 1596: 1591: 1578: 1570: 1562: 1554: 1550: 1546: 1540: 1532: 1528: 1517: 1516: 1515: 1498: 1491: 1487: 1482: 1476: 1471: 1468: 1465: 1461: 1457: 1454: 1447: 1446: 1445: 1442: 1440: 1436: 1429: 1428:ordered group 1425: 1421: 1415:. This makes 1414: 1410: 1406: 1402: 1395: 1393: 1389: 1382: 1378: 1374: 1367: 1364:that has the 1363: 1359: 1355: 1351: 1347: 1343: 1339: 1335: 1313: 1310: 1307: 1301: 1295: 1289: 1283: 1273: 1272: 1271: 1269: 1265: 1261: 1254: 1250: 1247: 1243: 1239: 1235: 1231: 1227: 1223: 1220:, denoted by 1219: 1218: 1213: 1209: 1205: 1201: 1197: 1178: 1175: 1166: 1158: 1155: 1152: 1148: 1138: 1130: 1126: 1119: 1116: 1111: 1108: 1103: 1097: 1085: 1077: 1076: 1075: 1073: 1067: 1063: 1059: 1054: 1050: 1046: 1042: 1038: 1034: 1029: 1025: 1021: 1014: 1010: 1006: 1002: 995: 977: 973: 971: 967: 963: 956: 950: 948: 944: 940: 935: 933: 929: 925: 921: 917: 913: 906: 901: 896: 892: 888: 881: 876: 868: 854: 848: 842: 836: 830: 823: 822: 821: 819: 815: 811: 804: 800: 799: 779: 768: 764: 758: 754: 747: 744: 737: 736: 735: 733: 729: 721: 717: 712: 708: 689: 686: 678: 675: 672: 668: 658: 654: 638: 634: 627: 624: 619: 616: 611: 608: 601: 600: 599: 597: 594:if it is the 593: 583: 581: 576: 573:Consider the 571: 569: 562: 555: 548: 541: 534: 530: 525: 521: 501: 496: 492: 488: 483: 479: 473: 470: 466: 460: 456: 448: 447: 446: 445: 440: 436: 432: 428: 424: 401: 397: 392: 386: 381: 377: 366: 362: 357: 351: 346: 342: 338: 328: 327: 326: 324: 321:. The number 320: 316: 312: 293: 288: 284: 280: 277: 274: 268: 255: 254: 253: 251: 244: 236: 234: 230: 226: 204: 197: 193: 188: 182: 178: 170: 169: 168: 166: 151: 149: 146: 142: 138: 131: 127: 123: 118: 116: 112: 108: 103: 101: 97: 93: 89: 82: 78: 75: 72: 68: 63: 61: 54: 50: 46: 42: 38: 34: 30: 26: 22: 4825: 4822:"AF-algebra" 4807: 4803: 4796: 4789: 4783: 4776: 4770: 4763: 4759: 4756:Effros, E.G. 4749: 4745: 4738: 4732: 4714: 4704: 4669: 4663: 4661: 4653: 4646: 4508: 4329: 4325: 4323: 4313: 4306: 4302: 4288: 4283: 4276: 4272: 4264: 4257: 4249: 4242: 4238: 4212: 4208: 4204: 4190: 4179: 4172: 4165: 4161: 4155: 4142: 4135: 4128: 4127:) such that 4124: 4117: 4110: 4106: 4103:directed set 4100: 4097: 4004: 3926: 3924: 3860: 3853: 3846: 3839: 3832: 3825: 3818: 3811: 3804: 3798: 3791: 3784: 3780: 3773: 3766: 3759: 3752: 3745: 3738: 3731: 3724: 3722: 3608: 3411: 3407: 3405: 3400: 3393: 3389: 3385: 3381: 3377: 3373: 3366: 3359: 3355: 3351: 3347: 3343: 3339: 3338: 3330: 3212: 3208: 3204: 3203: 3198: 3194: 3190: 3186: 3182: 3178: 3171: 3167: 3163: 3159: 3155: 3151: 3150: 3137: 3133: 3131: 3126: 3119: 3112: 3108: 3101: 3094: 3090: 3088: 3083: 3079: 3075: 3073: 3068: 3061: 3054: 3047: 3043: 3036: 3029: 3025: 3018: 3014: 3010: 3008: 3003: 2999: 2995: 2991: 2987: 2983: 2979: 2975: 2971: 2963: 2961: 2958:Riesz groups 2948: 2942: 2929: 2925: 2918: 2916: 2903: 2899: 2895: 2891: 2884: 2880: 2876: 2872: 2865: 2861: 2857: 2853: 2843: 2836: 2826: 2819: 2806: 2799: 2789: 2782: 2775: 2768: 2764: 2757: 2750: 2743: 2736: 2728: 2724: 2717: 2713: 2706: 2702: 2698: 2691: 2687: 2680: 2678: 2675: 2670: 2666: 2662: 2660: 2655: 2651: 2644: 2640: 2633: 2629: 2625: 2618: 2614: 2607: 2603: 2599: 2595: 2594: 2586: 2579: 2573: 2569: 2564: 2557: 2550: 2546: 2539: 2537: 2532: 2528: 2524: 2513: 2506: 2502: 2498: 2494: 2487: 2483: 2476: 2472: 2468: 2461: 2454: 2447: 2443: 2438: 2434: 2430: 2426: 2425: 2417: 2413: 2409: 2407: 2402: 2398: 2391: 2387: 2383: 2379: 2375: 2368: 2364: 2357: 2353: 2349: 2345: 2341: 2340: 2337: 2332: 2328: 2326: 2304: 2300: 2293: 2286: 2282: 2277: 2270: 2263: 2259: 2255: 2251: 2247: 2243: 2239: 2232: 2228: 2224: 2220: 2209: 2207: 2202: 2200: 2195: 2191: 2187: 2180: 2176: 2172: 2168: 2164: 2157: 2150: 2149:The triple ( 2148: 2039: 2032: 2027: 2022: 2020: 1920: 1916: 1912: 1905: 1901: 1897: 1895: 1890: 1883: 1876: 1869: 1862: 1855: 1848: 1844: 1837: 1833: 1826: 1822: 1815: 1808: 1806: 1794: 1790: 1783: 1777: 1773: 1769: 1764: 1757: 1750: 1743: 1739: 1734: 1727: 1721: 1714: 1710: 1706: 1702: 1695: 1691: 1684: 1677: 1673: 1669: 1665: 1654: 1647: 1640: 1636: 1634: 1513: 1443: 1438: 1431: 1423: 1416: 1412: 1408: 1404: 1397: 1396: 1391: 1384: 1376: 1369: 1357: 1353: 1349: 1345: 1341: 1337: 1331: 1267: 1263: 1259: 1252: 1248: 1241: 1237: 1233: 1229: 1225: 1221: 1215: 1211: 1207: 1203: 1199: 1193: 1071: 1065: 1061: 1057: 1052: 1048: 1044: 1040: 1036: 1032: 1027: 1023: 1019: 1012: 1008: 997: 991: 974: 969: 958: 954: 951: 946: 942: 938: 936: 931: 927: 923: 919: 915: 908: 904: 899: 894: 890: 883: 879: 874: 872: 806: 802: 796: 794: 731: 724: 719: 715: 710: 706: 704: 596:direct limit 591: 589: 579: 572: 564: 557: 550: 543: 536: 523: 519: 517: 443: 438: 434: 430: 426: 422: 420: 322: 318: 314: 310: 308: 246: 239: 237: 232: 228: 221: 219: 164: 162: 140: 136: 129: 119: 104: 99: 95: 91: 80: 64: 52: 45:Ola Bratteli 31:that is the 24: 18: 4849:C*-algebras 4670:hyperfinite 4256:with scale 4236:CAR algebra 4005:with scale 3358:such that ( 3335:The theorem 3076:Riesz group 2945:Riesz group 2203:contractive 1196:projections 1194:Denote the 994:K-theoretic 818:CAR algebra 705:where each 586:AF algebras 21:mathematics 4792:, 229-245. 4766:, 385-402. 4741:, 195-234. 4726:References 4649:conjecture 4311:Cantor set 3859:such that 3417:. Suppose 2970:. The set 2512:such that 2390:such that 2262:such that 429:matrix of 235:matrices. 148:metrizable 96:uniqueness 29:C*-algebra 16:C*-algebra 4832:EMS Press 4554:ρ 4482:ρ 4419:Γ 4309:) on the 4282:for some 4027:ϕ 4017:∪ 3953:⁡ 3948:→ 3897:⁡ 3892:→ 3838:). Again 3693:Γ 3690:∈ 3672:ϕ 3648:∈ 3620:Γ 3463:⁡ 3458:→ 3261:⁡ 3256:→ 3205:Corollary 3067:for each 2112:≤ 2106:≤ 2074:∈ 2053:Γ 1997:∈ 1973:∗ 1934:Γ 1462:⊕ 1362:semigroup 1311:⊕ 1244:for some 1176:⋯ 1173:→ 1145:→ 1123:→ 1120:⋯ 1117:⁡ 1112:→ 1090:∞ 855:… 852:⇉ 846:⇉ 840:⇉ 834:⇉ 775:¯ 755:∪ 687:⋯ 684:→ 655:α 649:→ 631:→ 628:⋯ 625:⁡ 620:→ 457:∑ 378:⊕ 374:→ 343:⊕ 336:Φ 281:⊗ 263:Φ 179:⊕ 139:), where 92:existence 71:separable 47:. Later, 4843:Category 4779:, 29-44. 4688:factor. 4680:factor. 4295:spectrum 4218:) = {0, 4152:Examples 3197:) = ker( 3024:≥ 0 and 2998:implies 2962:A group 2742: : 2679:Let Φ: ( 2632:)) and ( 2254: : 2223: : 1756:), then 1683: : 1668: : 1514:one has 575:category 126:topology 115:Haagerup 77:amenable 37:sequence 4834:, 2001 4291:Gelfand 4232:⁠ 4220:⁠ 4201:⁠ 4187:⁠ 4105:. If Γ( 3399:, then 3340:Theorem 2871:}. Let 2453:). Let 1662:functor 1650:) are: 1270:)/~ by 150:space. 88:functor 4690:Powers 4682:Connes 4509:where 4328:, the 4269:simple 3925:whose 3723:where 3376:)) = ( 3053:, and 2705:)) → ( 2527:, and 2401:, and 2031:, the 1807:Since 1360:)/~ a 996:group 309:where 220:where 111:Connes 74:simple 4696:Notes 4668:, or 4109:) = { 3506:where 3177:) → ( 3154:Let ( 3152:Lemma 3013:: if 2935:= Φ. 2756:) → 2727:), Γ( 2701:), Γ( 2654:), Γ( 2628:), Γ( 2567:) = ∪ 2467:into 2427:Lemma 2342:Lemma 2175:. If 2021:When 1902:scale 1426:) an 1228:, if 143:is a 35:of a 27:is a 23:, an 4709:1982 4608:and 4203:for 4141:... 4123:∈ Γ( 3866:= φ 3737:) = 3384:, Γ( 3372:, Γ( 3342:If ( 3189:and 3046:= Σ 3028:≤ Σ 2902:and 2894:and 2669:and 2602:and 2486:) → 2441:= (∪ 2437:AF, 2429:Let 2367:) → 2348:and 2331:and 2242:and 2198:}). 2163:, Γ( 1889:) = 1875:) = 1854:and 1709:and 1694:) → 1348:and 1340:and 1236:and 1210:and 992:The 877:= (∪ 795:The 542:and 124:and 113:and 65:The 4808:126 4764:102 4739:171 4345:Ell 4297:is 4207:in 3945:lim 3932:is 3889:lim 3864:12* 3455:lim 3253:lim 3201:). 3166:: ( 2978:of 2716:), 2690:), 2643:), 2617:), 2592:). 2280:= ∪ 2276:If 2171:of 1904:of 1836:), 1798:)). 1737:= ∪ 1441:). 1394:). 1251:in 1242:v*v 1234:vv* 1109:lim 1068:+ 1 968:of 893:in 801:of 617:lim 556:to 524:l k 439:l k 39:of 19:In 4845:: 4830:, 4824:, 4790:45 4777:38 4672:, 4644:. 4286:. 4241:, 4171:, 4134:≥ 3868:12 3857:12 3829:12 3824:= 3380:, 3365:, 3346:, 3211:, 3181:, 3170:, 3158:, 3129:. 3118:, 3100:, 3082:, 3074:A 3071:. 3060:≤ 3017:, 3006:. 3002:∈ 2994:∈ 2879:→ 2875:: 2860:→ 2856:: 2803:1* 2788:→ 2781:: 2740:1* 2576:n* 2535:. 2523:= 2516:m* 2505:→ 2501:: 2475:: 2397:= 2386:→ 2382:: 2356:: 2269:= 2258:→ 2227:→ 2215:: 2190:, 2179:= 2156:, 1923:: 1893:. 1672:→ 1639:↦ 1240:= 1232:= 1224:~ 1047:. 1039:× 1011:, 972:. 907:∩ 592:AF 570:. 567:lk 425:× 317:= 245:→ 231:× 117:. 4750:6 4686:∞ 4678:1 4632:) 4629:A 4626:( 4621:0 4617:K 4596:) 4593:A 4590:( 4585:+ 4581:T 4558:A 4533:) 4530:A 4527:( 4522:+ 4518:T 4494:, 4491:) 4486:A 4478:, 4475:) 4472:A 4469:( 4464:+ 4460:T 4456:, 4453:) 4450:A 4447:( 4442:1 4438:K 4434:, 4431:) 4428:) 4425:A 4422:( 4416:, 4411:+ 4407:) 4403:A 4400:( 4395:0 4391:K 4387:, 4384:) 4381:A 4378:( 4373:0 4369:K 4365:( 4362:( 4359:= 4356:) 4353:A 4350:( 4326:A 4314:X 4307:X 4305:( 4303:C 4284:k 4279:k 4277:M 4273:Q 4265:A 4263:( 4261:0 4258:K 4250:A 4248:( 4246:0 4243:K 4239:A 4229:2 4226:/ 4223:1 4216:2 4213:M 4209:Z 4205:a 4198:2 4195:/ 4191:a 4183:2 4180:M 4178:( 4176:0 4173:K 4169:2 4166:M 4162:Q 4145:k 4143:v 4139:1 4136:v 4131:k 4129:u 4125:G 4120:k 4118:u 4113:k 4111:v 4107:G 4083:. 4080:] 4075:G 4071:u 4067:, 4064:0 4061:[ 4058:= 4055:] 4050:k 4046:u 4042:, 4039:0 4036:[ 4031:k 4021:k 3990:, 3987:) 3982:+ 3977:k 3973:G 3969:, 3964:k 3960:G 3956:( 3930:0 3927:K 3910:, 3905:k 3901:A 3884:= 3881:A 3861:α 3854:α 3850:2 3847:A 3843:2 3840:u 3836:1 3833:u 3831:( 3826:φ 3822:2 3819:u 3815:1 3812:u 3808:1 3805:G 3802:1 3799:G 3795:1 3792:A 3788:1 3785:H 3781:Z 3777:1 3774:G 3770:1 3767:H 3763:1 3760:u 3756:1 3753:G 3749:1 3746:u 3741:G 3739:u 3735:1 3732:u 3730:( 3728:1 3725:φ 3708:, 3705:} 3702:) 3699:G 3696:( 3687:) 3684:v 3681:( 3676:1 3667:| 3661:+ 3656:1 3652:H 3645:v 3642:{ 3639:= 3636:) 3631:1 3627:H 3623:( 3594:. 3591:) 3584:k 3580:n 3574:+ 3569:Z 3564:, 3557:k 3553:n 3547:Z 3542:( 3539:= 3536:) 3531:+ 3526:k 3522:H 3518:, 3515:H 3512:( 3500:, 3497:) 3492:+ 3487:k 3483:H 3479:, 3474:k 3470:H 3466:( 3450:= 3447:) 3442:+ 3438:G 3434:, 3431:G 3428:( 3414:G 3412:u 3408:G 3401:A 3396:G 3394:u 3390:G 3386:G 3382:G 3378:G 3374:A 3370:0 3367:K 3363:0 3360:K 3356:A 3352:G 3348:G 3344:G 3316:, 3313:) 3306:k 3302:n 3296:+ 3291:Z 3286:, 3279:k 3275:n 3269:Z 3264:( 3248:= 3245:) 3240:+ 3236:G 3232:, 3229:G 3226:( 3213:G 3209:G 3199:ϕ 3195:σ 3191:ψ 3187:σ 3183:G 3179:G 3175:+ 3172:Z 3168:Z 3164:ϕ 3160:G 3156:G 3134:Z 3127:A 3123:0 3120:K 3116:0 3113:K 3109:Z 3105:0 3102:K 3098:0 3095:K 3091:A 3084:G 3080:G 3078:( 3069:i 3064:i 3062:y 3057:i 3055:x 3050:i 3048:x 3044:x 3039:i 3037:x 3032:i 3030:y 3026:x 3021:i 3019:y 3015:x 3004:G 3000:g 2996:G 2992:g 2990:· 2988:k 2984:G 2980:G 2972:G 2964:G 2952:0 2949:K 2933:* 2930:φ 2926:k 2922:0 2919:K 2904:B 2900:A 2896:ψ 2892:φ 2887:n 2885:ψ 2881:A 2877:B 2873:ψ 2868:n 2866:φ 2862:B 2858:A 2854:φ 2847:1 2844:ψ 2840:0 2837:K 2832:. 2830:0 2827:K 2823:2 2820:A 2812:. 2810:2 2807:A 2800:β 2793:1 2790:B 2786:1 2783:A 2779:1 2776:φ 2772:1 2769:B 2765:B 2763:( 2761:0 2758:K 2754:1 2751:A 2749:( 2747:0 2744:K 2737:α 2729:B 2725:B 2723:( 2721:0 2718:K 2714:B 2712:( 2710:0 2707:K 2703:A 2699:A 2697:( 2695:0 2692:K 2688:A 2686:( 2684:0 2681:K 2671:B 2667:A 2656:B 2652:B 2650:( 2648:0 2645:K 2641:B 2639:( 2637:0 2634:K 2630:A 2626:A 2624:( 2622:0 2619:K 2615:A 2613:( 2611:0 2608:K 2604:B 2600:A 2589:n 2587:B 2585:( 2583:0 2580:K 2574:β 2570:n 2565:B 2563:( 2561:0 2558:K 2554:0 2551:K 2547:A 2545:( 2543:0 2540:K 2533:B 2529:φ 2525:ψ 2521:* 2518:φ 2514:β 2509:m 2507:B 2503:A 2499:φ 2495:B 2493:( 2491:0 2488:K 2484:A 2482:( 2480:0 2477:K 2473:ψ 2469:B 2464:m 2462:B 2457:m 2455:β 2450:n 2448:B 2444:n 2439:B 2435:B 2431:A 2421:0 2418:K 2414:ψ 2410:B 2403:φ 2399:ψ 2395:* 2392:φ 2388:B 2384:A 2380:φ 2376:B 2374:( 2372:0 2369:K 2365:A 2363:( 2361:0 2358:K 2354:ψ 2350:B 2346:A 2333:B 2329:A 2310:. 2307:n 2305:A 2301:A 2296:n 2294:A 2292:( 2289:n 2287:α 2283:n 2278:A 2273:. 2271:ψ 2267:* 2264:α 2260:B 2256:A 2252:α 2248:ψ 2244:B 2240:A 2236:* 2233:α 2229:B 2225:A 2221:α 2213:0 2210:K 2196:s 2192:Z 2188:Z 2183:s 2181:M 2177:A 2173:A 2165:A 2161:0 2158:K 2154:0 2151:K 2134:. 2131:} 2128:] 2123:A 2119:1 2115:[ 2109:x 2103:0 2098:| 2093:) 2090:A 2087:( 2082:0 2078:K 2071:x 2068:{ 2065:= 2062:) 2059:A 2056:( 2040:A 2036:0 2033:K 2028:A 2023:A 2006:. 2003:} 2000:A 1994:p 1991:= 1986:2 1982:p 1978:= 1969:p 1963:| 1958:] 1955:p 1952:[ 1949:{ 1946:= 1943:) 1940:A 1937:( 1921:A 1917:A 1913:A 1911:( 1909:0 1906:K 1898:A 1891:Z 1887:4 1884:M 1882:( 1880:0 1877:K 1873:2 1870:M 1868:( 1866:0 1863:K 1859:4 1856:M 1852:2 1849:M 1841:0 1838:K 1834:A 1832:( 1830:∞ 1827:M 1823:A 1821:( 1819:∞ 1816:M 1814:( 1812:∞ 1809:M 1795:n 1791:A 1789:( 1787:0 1784:K 1782:( 1780:* 1778:n 1774:α 1770:n 1765:A 1763:( 1761:0 1758:K 1753:n 1751:A 1749:( 1746:n 1744:α 1740:n 1735:A 1731:0 1728:K 1724:. 1722:α 1718:* 1715:α 1711:B 1707:A 1703:B 1701:( 1699:0 1696:K 1692:A 1690:( 1688:0 1685:K 1681:* 1678:α 1674:B 1670:A 1666:α 1658:0 1655:K 1648:A 1646:( 1644:0 1641:K 1637:A 1620:. 1617:) 1612:m 1607:+ 1602:Z 1597:, 1592:m 1587:Z 1582:( 1579:= 1576:) 1571:+ 1567:) 1563:A 1560:( 1555:0 1551:K 1547:, 1544:) 1541:A 1538:( 1533:0 1529:K 1525:( 1499:, 1492:k 1488:n 1483:M 1477:m 1472:1 1469:= 1466:k 1458:= 1455:A 1439:A 1437:( 1434:0 1432:K 1424:A 1422:( 1419:0 1417:K 1413:q 1409:p 1405:A 1403:( 1400:0 1398:K 1392:A 1390:( 1387:0 1385:K 1377:A 1375:( 1372:0 1370:K 1358:A 1356:( 1354:P 1350:q 1346:p 1342:q 1338:p 1317:] 1314:q 1308:p 1305:[ 1302:= 1299:] 1296:q 1293:[ 1290:+ 1287:] 1284:p 1281:[ 1268:A 1266:( 1264:P 1260:A 1258:( 1256:∞ 1253:M 1249:v 1238:q 1230:p 1226:q 1222:p 1212:q 1208:p 1204:A 1202:( 1200:P 1179:. 1170:) 1167:A 1164:( 1159:1 1156:+ 1153:n 1149:M 1142:) 1139:A 1136:( 1131:n 1127:M 1104:= 1101:) 1098:A 1095:( 1086:M 1072:A 1070:( 1066:n 1062:M 1058:A 1056:( 1053:n 1049:M 1045:A 1041:n 1037:n 1033:A 1031:( 1028:n 1024:M 1020:A 1018:( 1016:0 1013:K 1009:A 1000:0 998:K 987:0 985:K 970:A 961:n 959:A 955:n 947:A 943:A 939:A 932:A 928:S 924:S 920:A 916:J 911:n 909:A 905:J 903:( 900:n 895:A 891:J 886:n 884:A 880:n 875:A 849:8 843:4 837:2 831:1 809:i 807:α 803:A 780:. 769:n 765:A 759:n 748:= 745:A 732:A 727:i 725:α 720:i 716:α 711:i 707:A 690:, 679:1 676:+ 673:i 669:A 659:i 639:i 635:A 612:= 609:A 580:N 565:r 560:l 558:m 553:k 551:n 546:l 544:m 539:k 537:n 520:r 502:. 497:l 493:m 489:= 484:k 480:n 474:k 471:l 467:r 461:k 444:l 435:r 433:( 427:s 423:t 402:l 398:m 393:M 387:t 382:1 367:k 363:n 358:M 352:s 347:1 339:: 323:r 319:j 315:i 313:· 311:r 294:, 289:r 285:I 278:a 275:= 272:) 269:a 266:( 249:j 247:M 242:i 240:M 233:i 229:i 224:i 222:M 205:, 198:k 194:n 189:M 183:k 165:A 141:X 137:X 135:( 133:0 130:C 84:0 81:K 56:0 53:K

Index

mathematics
C*-algebra
inductive limit
sequence
finite-dimensional
Ola Bratteli
George A. Elliott
ordered abelian groups
classification theorem
separable
simple
amenable
functor
von Neumann algebra
Connes
Haagerup
noncommutative geometry
topology
totally disconnected
metrizable
Bratteli diagram
directed graph
category
direct limit
Bratteli diagram
Pascal triangle
CAR algebra
approximate unit
K-theoretic
topological K-theory

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