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Separable C*-algebras and weak* fixed point property

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Języki publikacji
EN
Abstrakty
EN
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
Rocznik
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
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bwmeta1.element.baztech-3fbffcd4-7296-444a-ab6b-d9a5b9514ccd
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