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Categorical problems in minimal spaces

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Part of the book series: Lecture Notes in Mathematics ((LNM,volume 540))

Abstract

A space X with a topological property P is called minimal P if X has no strictly coarser topology with property P and is called P-closed if X is a closed set in every space with property P that contains X as a subspace. This paper surveys, from a categorical viewpoint, a number of results recently obtained in minimal P and P-closed spaces where P includes the properties of regular Hausdorff, extremally disconnected Hausdorff, and the separation axioms S(α) for each ordinal α>0. Particular attention is focused on some of the categorical problems in these areas.

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References

  • B B. Banaschewski, Über Hausdorffsch-minimale Erweiterungen von Räumen, Arch. Math. 12 (1961), 355–365.

    Article  MathSciNet  MATH  Google Scholar 

  • BPS M. P. Berri, J. R. Porter, and R. M. Stephenson, Jr., A survey of minimal topological spaces, General Topology and its Relations to Modern Analysis and Algebra III, Proc. Kanpur Top. Conf. 1968, Acad. Press, New York, 1970, 93–114.

    Google Scholar 

  • F S. Fomin, Extensions of topological spaces, Ann. of Math. 44 (1943), 471–480.

    Article  MathSciNet  MATH  Google Scholar 

  • FL Z. Frolík and C. T. Liu, An embedding characterization of almost realcompact spaces, Proc. Amer. Math. Soc. 32 (1972), 294–298.

    Article  MathSciNet  MATH  Google Scholar 

  • Hal D. Harris, Katětov extension as a functor, Math. Ann. 193 (1971), 171–175.

    Article  MathSciNet  MATH  Google Scholar 

  • Ha2 D. Harris, Structures in topology, Mem. Amer. Math. Soc. 115 (1971).

    Google Scholar 

  • Ha3-, Regular-closed spaces and proximities, Pacific J. Math 34 (1970), 675–685.

    Article  MathSciNet  MATH  Google Scholar 

  • Hel H. Herrlich, On the concept of reflections in general topology, Contributions to Extension Theory of Topological Structures, VEB Deutscher Verlag der Wissenschaften, Berlin (1969), 105–114.

    Google Scholar 

  • He2-, Regular-closed, Urysohn-closed and completely Hausdorffclosed spaces, Proc. Amer. Math. Soc. 26 (1970), 695–698.

    MathSciNet  MATH  Google Scholar 

  • He3-, Tv-Abgeschlossenheit und Tv-Minimalität, Math. Z. 88 (1965), 285–294.

    Article  MathSciNet  MATH  Google Scholar 

  • He4-, Categorical topology, Gen. Top. and its Appl. 1 (1971), 1–15.

    Article  MathSciNet  MATH  Google Scholar 

  • HS1-, and G. E. Strecker, H-closed spaces and reflective subcategories, Math. Annalen 177 (1968), 302–309.

    Article  MathSciNet  MATH  Google Scholar 

  • HS2 H. Herrlich, Category Theory, Allyn and Bacon, Boston, 400 pp.

    Google Scholar 

  • K M. Katětov, Über H-abgeschlossene und bikompakt Räume, Časopis Pěst. Mat., 69 (1940), 36–49.

    MATH  Google Scholar 

  • L C. T. Liu, Absolutely closed spaces, Trans. Amer. Math. Soc. 130 (1968), 86–104.

    Article  MathSciNet  MATH  Google Scholar 

  • O F. Obreanu, Spatii Separate Minimale, An. Acad. Repub., Pop. Romîne, Sect. Sti. Mat. Fiz. Chem. Ser. A 3(1950), 325–349.

    MathSciNet  Google Scholar 

  • Pa I. I. Parovičenko, On suprema of families of H-closed extensions of Hausdorff spaces, Soviet Math. Kokl. 11 (1970), 1114–1118.

    Google Scholar 

  • Pol J. R. Porter, Extension function and subcategories of HAUS, Canad. Math. Bull. 18 (4) (1975), 587–590.

    Article  MathSciNet  MATH  Google Scholar 

  • Po2-, Not all semiregular Urysohn-closed spaces are Katětov-Urysohn, Proc. Amer. Math. Soc. 25 (1970), 518–520.

    MathSciNet  MATH  Google Scholar 

  • PT-, and J. D. Thomas, On H-closed and minimal Hausdorff spaces, Trans. Amer. Math. Soc. 138 (1969), 159–170.

    MathSciNet  MATH  Google Scholar 

  • PV1-, and C. Votaw, S(α) spaces and regular Hausdorff extensions, Pacific J. Math. 45 (1973), 327–345.

    Article  MathSciNet  MATH  Google Scholar 

  • PV2-, H-closed extension I, Gen. Top. and its Appl. 3 (1973), 211–224.

    Article  MATH  Google Scholar 

  • PV3-, H-closed extension II, Trans. Amer. Math. Soc. 202 (1975), 193–209.

    MathSciNet  MATH  Google Scholar 

  • PW J. R. Porter and R. G. Woods, Minimal extremally disconnected Hausdorff spaces, submitted.

    Google Scholar 

  • S1 R. M. Stephenson, Jr., Some unsolved problems concerning P-minimal and P-closed spaces, Proc. Memphis Top. Conf. 1975, to appear.

    Google Scholar 

  • S2-, Products of minimal Urysohn spaces, Duke Math. J. 38 (1971), 703–707.

    Article  MathSciNet  MATH  Google Scholar 

  • SW G. E. Strecker and E. Wattel, On semiregular and minimal Hausdorff embeddings, Proc. Kon. Ned. Akad. v. Wet. A70 (1967), 234–237.

    MathSciNet  MATH  Google Scholar 

  • T A. Tychonoff, Über die topologische Erweiterung von Räumen, Math. Ann., 102 (1930), 544–561.

    Article  MathSciNet  MATH  Google Scholar 

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Authors

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Ernst Binz Horst Herrlich

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© 1976 Springer-Verlag

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Porter, J.R. (1976). Categorical problems in minimal spaces. In: Binz, E., Herrlich, H. (eds) Categorical Topology. Lecture Notes in Mathematics, vol 540. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0080872

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  • DOI: https://doi.org/10.1007/BFb0080872

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-07859-3

  • Online ISBN: 978-3-540-38118-1

  • eBook Packages: Springer Book Archive

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