ArticleOriginal scientific text
Title
Examples of sequential topological groups under the continuum hypothesis
Authors 1
Affiliations
- Department of Mathematics, Auburn University, Auburn, Alabama 36849, U.S.A.
Abstract
Using CH we construct examples of sequential topological groups: 1. a pair of countable Fréchet topological groups whose product is sequential but is not Fréchet, 2. a countable Fréchet and topological group which contains no copy of the rationals.
Keywords
topological group, sequential space, Fréchet space
Bibliography
- [A1] A. Arkhangel'skiĭ, The frequency spectrum of a topological space and the classification of spaces, Soviet Math. Dokl. 13 (1972), 265-268.
- [A2] A. Arkhangel'skiĭ, Topological properties in topological groups, in: XVIII All Union Algebraic Conference, Kishinev, 1985 (in Russian).
- [A3] A. Arkhangel'skiĭ, The frequency spectrum of a topological space and the product operation, Trans. Moscow Math. Soc. 2 (1981), 163-200.
- [AF] A. Arkhangel'skiĭ and S. Franklin, Ordinal invariants for topological spaces, Michigan Math. J. 15 (1968), 313-320.
- [BR] T. Boehme and M. Rosenfeld, An example of two compact Fréchet Hausdorff spaces whose product is not Fréchet, J. London Math. Soc. 8 (1974), 339-344.
- [BM] D. Burke and E. Michael, On a theorem of V. V. Filippov, Israel J. Math. 11 (1972), 394-397.
- [vD] E. K. van Douwen, The product of a Fréchet space and a metrizable space, Topology Appl. 47 (1992), 163-164.
- [DS] A. Dow and J. Steprāns, Countable Fréchet
-spaces may be first-countable, Arch. Math. Logic 32 (1992), 33-50. - [EKN] K. Eda, S. Kamo and T. Nogura, Spaces which contain a copy of the rationals, J. Math. Soc. Japan 42 (1990), 103-112.
- [F] S. Franklin, Spaces in which sequences suffice, Fund. Math. 57 (1965), 107-115.
- [GMT] G. Gruenhage, E. Michael and Y. Tanaka, Spaces determined by point-countable covers, Pacific J. Math. 113 (1984), 303-332.
- [MS] V. Malykhin and B. Shapirovskiĭ, Martin's axiom and properties of topological spaces, Soviet Math. Dokl. 14 (1973), 1746-1751.
- [M1] E. Michael,
-spaces, J. Math. Mech. 15 (1966), 983-1002. - [M2] E. Michael, A quintuple quotient quest, Gen. Topology Appl. 2 (1972), 91-138.
- [No1] T. Nogura, The product of
-spaces, Topology Appl. 21 (1985), 251-259. - [No2] T. Nogura, Products of sequential convergence properties, Czechoslovak Math. J. 39 (1989), 262-279.
- [NST1] T. Nogura, D. Shakhmatov and Y. Tanaka, Metrizability of topological groups having weak topologies with respect to good covers, Topology Appl. 54 (1993), 203-212.
- [NST2] T. Nogura, D. Shakhmatov and Y. Tanaka,
-property versus A-property in topological spaces and groups, to appear. - [NT] T. Nogura and Y. Tanaka, Spaces which contain a copy of
or and their applications, Topology Appl. 30 (1988), 51-62. - [N] P. J. Nyikos, Metrizability and Fréchet-Urysohn property in topological groups, Proc. Amer. Math. Soc. 83 (1981), 793-801.
- [O] R. C. Olson, Bi-quotient maps, countably bi-sequential spaces, and related topics, Gen. Topology Appl. 4 (1974), 1-28.
- [R] M. Rajagopalan, Sequential order and spaces
, Proc. Amer. Math. Soc. 54 (1976), 433-438. - [Sm] D. Shakhmatov,
-properties in Fréchet-Urysohn topological groups, Topology Proc. 15 (1990), 143-183. - [Sh] A. Shibakov, A sequential group topology on rationals with intermediate sequential order, Proc. Amer. Math. Soc. 124 (1996), 2599-2607.
- [Si] P. Simon, A compact Fréchet space whose square is not Fréchet, Comment. Math. Univ. Carolin. 21 (1980), 749-753.
- [T] S. Todorčević, Some applications of S- and L-combinatorics, in: The Work of Mary Ellen Rudin, F. D. Tall (ed.), Ann. New York Acad. Sci. 705, 1993, 130-167.