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Free products of topological groups

  • Sidney A. Morris (a1)
Abstract

In this note the notion of a free topological product Gα of a set {Gα} of topological groups is introduced. It is shown that it always exists, is unique and is algebraically isomorphic to the usual free product of the underlying groups. Further if each Gα is Hausdorff, then Gα is Hausdorff and each Gα is a closed subgroup. Also Gα is a free topological group (respectively, maximally almost periodic) if each Gα is. This notion is then combined with the theory of varieties of topological groups developed by the author. For a variety of topological groups, the -product of groups in is defined. It is shown that the -product, Gα of any set {Gα} of groups in exists, is unique and is algebraically isomorphic to the usual varietal product. It is noted that the -product of Hausdorff groups is not necessarily Hausdorff, but is if is abelian. Each Gα is a quotient group of Gα. It is proved that the -product of free topological groups of and projective topological groups of are of the same type. Finally it is shown that Gα is connected if and only if each Gα is connected.

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Copyright
References
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[1]Dugundji, James, Topology (Allyn and Bacon, Boston, 1966).
[2]Golema, K., “Free products of compact general algebras”, Colloq. Math. 13 (1965), 165166.
[3]Graev, M.I., “Free topological groups”, Izv. Akad. Nauk SSSR Ser. Mat. 12 (1948), 279324, (Russian). English transl., Amer. Math. Soc. Transl. no. 35, (1951). Reprint Amer. Math. Soc. Transl. (1) 8 (1962), 305–364.
[4]Hall, C.E., “Projective topological groups”, Proc. Amer. Math. Soc. 18 (1967), 425431.
[5]Hall, Marshall Jr, The theory of groups (The Macmillan Company, New York, 1959).
[6]Hewitt, Edwin and Ross, Kenneth A., Abstract harmonic analysis, Vol. I (Die Grundlehren der mathematischen Wissenschaften, Band 115; Springer-Verlag, Berlin, Göttingen, Heidelberg, 1963).
[7]Hulanicki, A., “Isomorphic embeddings of free products of compact groups”, Colloq. Math. 16 (1967), 235241.
[8]Kelley, John L., General topology (Van Nostrand, Toronto, New York, London, 1955).
[9]Markov, A.A., “On free topological groups”, C.R. (Doklady) Acad. Sci. URSS, (N.S.) 31 (1941), 299301. Bull. Acad. Sci. URSS Sér. Math. [Izv. Adak. Nauk SSSR] 9 (1945), 3–64. (Russian. English summary). English Transl., Amer. Math. Soc. Transl. no. 30 (1950), 11–88; reprint Amer. Math. Soc. Transl. (1) 8 (1962), 195–272.
[10]Morris, Sidney A., “Varieties of topological groups”, Bull. Austral. Math. Soc. 1 (1969), 145160.
[11]Morris, Sidney A., “Varieties of topological groups II”, Bull. Austral. Math. Soc. 2 (1970), 113.
[12]Morris, Sidney A., “Varieties of topological groups III”, Bull. Austral. Math. Soc. 2 (1970), 165178.
[13]Morris, Sidney A., “Varieties of topological groups”, Ph.D. thesis, The Flinders University of South Australia, February 1970. [Abstract: Bull. Austral. Math. Soc. 3 (1970), 429431.]
[14]Neumann, Hanna, Varieties of groups (Ergebnisse der Mathematik und ihrer Grenzgebiete, Band 37, Springer-Verlag, Berlin, Heidelberg, New York, 1967).
[15]Neumann, J. v., “Almost periodic functions in a group. I”, Trans. Amer. Math. Soc. 36 (1934), 445492.
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Bulletin of the Australian Mathematical Society
  • ISSN: 0004-9727
  • EISSN: 1755-1633
  • URL: /core/journals/bulletin-of-the-australian-mathematical-society
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