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Abstrakty
We show that the spectrum  of a separable C∗-algebra A is discrete if and only if A∗, the Banach space dual of A, has the weak∗ fixed point property. We prove further that these properties are equivalent among others to the uniform weak∗ Kadec-Klee property of A∗ and to the coincidence of the weak∗ topology with the norm topology on the pure states of A. If one assumes the set-theoretic diamond axiom, then the separability is necessary.
Słowa kluczowe
Czasopismo
Rocznik
Tom
Strony
233--241
Opis fizyczny
Bibliogr. 28 poz.
Twórcy
autor
- Faculty of Mathematics, University of Vienna, Oskar-Morgenstern-Platz 1, 1090 Wien, Austria
autor
- Institut für Angewandte Mathematik, Universität Heidelberg, Im Neuenheimer Feld, Gebäude 294, 69120 Heidelberg, Germany
Bibliografia
- [1] C. Akemann and N. Weaver, Consistency of a counterexample to Naimark’s problem, Proc. Natl. Acad. Sci. USA 101 (20) (2004), pp. 7522-7525.
- [2] D. Alspach, A fixed point free nonexpansive map, Proc. Amer. Math. Soc. 82 (1981), pp. 423-424.
- [3] J. Anderson, On vector states and separable C∗-algebras, Proc. Amer. Math. Soc. 65 (1) (1977), pp. 62-64.
- [4] M. B. Bekka, E. Kaniuth, A. T. Lau, and G. Schlichting, Weak∗-closedness of subspaces of Fourier-Stieltjes algebras and weak∗-continuity of the restriction map, Trans. Amer. Math. Soc. 350 (6) (1998), pp. 2277-2296.
- [5] J. Dixmier, C∗-algebras, translated from French by Francis Jellett, North-Holland Math. Library, Vol. 15, North-Holland Publishing Co., Amsterdam 1977.
- [6] D. van Dulst and B. Sims, Fixed points of nonexpansive mappings and Chebyshev centers in Banach spaces with norms of type (KK), in: Banach Space Theory and Its Applications (Bucharest, 1981), Lecture Notes in Math., Vol. 991, Springer, Berlin 1983, pp. 35-43.
- [7] G. Fendler, A. T.-M. Lau, and M. Leinert, Weak∗ fixed point property and asymptotic centre for the Fourier-Stieltjes algebra of a locally compact group, J. Funct. Anal. 264 (1) (2013), pp. 288-302.
- [8] J. G. Glimm, A Stone-Weierstrass theorem for C∗-algebras, Ann. of Math. (2) 72 (1960), pp. 216-244.
- [9] J. G. Glimm, Type I C∗-algebras, Ann. of Math. (2) 73 (3) (1961), pp. 572-612.
- [10] J. G. Glimm and R. V. Kadison, Unitary operators in C∗-algebras, Pacific J. Math. 10 (1960), pp. 547-556.
- [11] R. V. Kadison and J. R. Ringrose, Fundamentals of the Theory of Operator Algebras. Vol. II: Advanced Theory, Pure Appl. Math., Vol. 100, Academic Press Inc., Orlando, FL, 1986.
- [12] W. A. Kirk, A fixed point theorem for mappings which do not increase distances, Amer. Math. Monthly 72 (1965), pp. 1004-1006.
- [13] M. Kusuda, Three-space problems in discrete spectra of C∗-algebras and dual C∗-algebras, Proc. Roy. Soc. Edinburgh Sect. A 131 (3) (2001), pp. 701-707.
- [14] A. T.-M. Lau, Fixed point and related geometric properties on the Fourier and Fourier-Stieltjes algebras of locally compact groups, Lecture at the International Conference on Abstract Harmonic Analysis, Granada, Spain, May 20-24, 2013.
- [15] A. T.-M. Lau and M. Leinert, Fixed point property and the Fourier algebra of a locally compact group, Trans. Amer. Math. Soc. 360 (12) (2008), pp. 6389-6402.
- [16] A. T.-M. Lau and P. F. Mah, Quasi-normal structures for certain spaces of operators on a Hilbert space, Pacific J. Math. 121 (1) (1986), pp. 109-118.
- [17] A. T.-M. Lau and P. F. Mah, Normal structure in dual Banach spaces associated with a locally compact group, Trans. Amer. Math. Soc. 310 (1) (1988), pp. 341-353.
- [18] A. T.-M. Lau and P. F. Mah, Fixed point property for Banach algebras associated to locally compact groups, J. Funct. Anal. 258 (2) (2010), pp. 357-372.
- [19] A. T.-M. Lau, P. F. Mah, and A. Ülger, Fixed point property and normal structure for Banach spaces associated to locally compact groups, Proc. Amer. Math. Soc. 125 (7) (1997), pp. 2021-2027.
- [20] C. Lennard, C1 is uniformly Kadec-Klee, Proc. Amer. Math. Soc. 109 (1) (1990), pp. 71-77.
- [21] T. C. Lim, Asymptotic centers and nonexpansive mappings in conjugate Banach spaces, Pacific J. Math. 90 (1) (1980), pp. 135-143.
- [22] J. L. Marcelino Nahny, La stabilité des espaces Lp non-commutatifs, Math. Scand. 81 (2) (1997), pp. 212-218.
- [23] M. A. Naĭmark, Rings with involutions, Uspekhi Mat. Nauk (N.S.) 3 (27) (5) (1948), pp. 52-145.
- [24] M. A. Naĭmark, On a problem of the theory of rings with involution, Uspekhi Mat. Nauk (N.S.) 6 (46) (6) (1951), pp. 160-164.
- [25] G. K. Pedersen, C∗-algebras and Their Automorphism Groups, London Math. Soc. Monogr., Vol. 14, Academic Press Inc. [Harcourt Brace Jovanovich Publishers], London 1979.
- [26] N. Randrianantoanina, Fixed point properties of semigroups of nonexpansive mappings, J. Funct. Anal. 258 (11) (2010), pp. 3801-3817.
- [27] A. Rosenberg, The number of irreducible representations of simple rings with no minimal ideals, Amer. J. Math. 75 (1953), pp. 523-530.
- [28] M. Takesaki, Theory of Operator Algebras. I, Encyclopaedia Math. Sci., Vol. 124, Springer, Berlin, 2002. Reprint of the first (1979) edition in Oper. Alg. Non-commut. Geom. 5.
Uwagi
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).
Typ dokumentu
Bibliografia
Identyfikator YADDA
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