On metrizable subsets of hereditarily normal compact spaces

Authors

  • Heikki Junnila University of Helsinki
  • Kazuo Tomoyasu Miyakonojo College

Keywords:

hereditarily normal, $\omega_1$-compact, rim-Lindelöf

Abstract

Let $X$ be a metrizable space which has a hereditarily normal $\omega_1$-compactification. We show that $X$ is rim-separable and that if $X$ is also connected, then $w(X) \leq \omega_1$ and $X$ has a $\sigma$-point-finite base by sets with separable boundaries.

References

P.S. Alexandroff, Über die Struktur der bikompakten topologischen Räume, Math. Ann. 92 (1924), 294-301.

P. Cairns, H. Junnila, P. Nyikos, An application of Mary Ellen Rudin's solution to Nikiel's Conjecture, Topology and its Appl. 195 (2015), 26-33.

P.J. Collins, Monotone normality, Topology and its Appl. 74 (1996), 179-198.

R. Engelking, General Topology, PWN, Warszawa (1977).

T. Hoshina, Countable-points compactification for metric spaces, Fundamenta Math. 103 (1979), 123-132.

F.B. Jones, A theorem concerning locally peripherally separable spaces, Bull. Amer. Math. Soc. 41 (1935), 437-439.

F.B. Jones, On a property related to separability in metric spaces, Journal of the Elisha Mitchell Scientific Society, 70 (1954), 30-33.

H.J.K. Junnila, Eberlein compact spaces and continuous semilattices, in Z. Frolík, ed., General Topology and its Relation to Modern Analysis and Algebra VI, Proc. 6th Prague Topological Symposium 1986 (Helderman Verlag, Berlin 1988) 297322.

H. Junnila, Z. Yun, K. Tomoyasu, Hereditarily normal extensions, Topology and its Appl. 136 (2004), 1-6.

P. Nyikos, Applications of some strong set-theoretic axioms to locally compact $T_5$ and hereditarily scwH spaces, Fundamenta Math. 176 (2003), 25-45.

P. Roy, Separablility of metric spaces, Trans. Amer. Math. Soc. 149 (1970), 19-43.

L.B. Treybig, Concerning certain locally peripherally separable spaces, Pacific J. Math. 10 (1960), 697-704.

P. Zenor, Monotonically normal spaces, Notices Amer. Math. Soc. 17 (1970), 1034.

Published

2021-04-25

How to Cite

Junnila, H., & Tomoyasu, K. (2021). On metrizable subsets of hereditarily normal compact spaces. Topology Proceedings, 59, 153–162. Retrieved from https://topology.journals.yorku.ca/index.php/tp/article/view/38

Issue

Section

General and Set Theoretic Topology (Research Papers)