Hostname: page-component-cd9895bd7-dk4vv Total loading time: 0 Render date: 2024-12-25T14:07:39.676Z Has data issue: false hasContentIssue false

Separating H-sets by Open Sets

Published online by Cambridge University Press:  20 November 2018

Jack Porter
Affiliation:
Department of Mathematics, University of Kansas, Lawrence, KS 66045, USA e-mail: [email protected]
Mohan Tikoo
Affiliation:
Department of Mathematics, Southeast Missouri State University, Cape Girardeau, MO 63701, USA e-mail: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

In an $\text{H}$-closed, Urysohn space, disjoint $\text{H}$-sets can be separated by disjoint open sets. This is not true for an arbitrary H-closed space even if one of the $\text{H}$-sets is a point. In this paper, we provide a systematic study of those spaces in which disjoint $\text{H}$-sets can be separated by disjoint open sets.

Type
Research Article
Copyright
Copyright © Canadian Mathematical Society 2010

References

[1] Alexandroff, P. S. and Urysohn, P., Zur Theorie der topologischen Räume. Math. Ann. 92, 1924, no. 3-4, 258266. doi:10.1007/BF01448008Google Scholar
[2] Dickman, R. F. Jr. and Porter, J. R., θ-closed subsets of Hausdorff spaces. Pacific. J. Math. 59(1975), no. 2, 407415.Google Scholar
[3] Dickman, R. F. Jr. Porter, J. R., and Rubin, L. R., Completely regular absolutes and projective objects. Pacific. J. Math. 94(1981), no. 2, 277295.Google Scholar
[4] Fomin, S. Extensions of topological spaces. Ann. of Math. 44(1943), 471480. doi:10.2307/1968976Google Scholar
[5] Hodel, R. E., A theory of convergence and cluster points based on κ-nets. Top. Proc. 35(2010), 291330.Google Scholar
[6] Iliadis, S., Absolutes of Hausdorff spaces Dokl. Akad. Nauk. SSSR 149(1963)2225.Google Scholar
[7] Porter, J. and Tikoo, M., On Katětov spaces. Canad. Math. Bull. 32(1989), no. 4, 425433.Google Scholar
[8] Porter, J. and Votaw, C., S(α) spaces and regular Hausdorff extensions. Pacific J. Math 45(1973), 327345.Google Scholar
[9] Porter, J. and Woods, G., Extensions and Absolutes of Hausdorff Spaces. Springer-Verlag, New York, 1988.Google Scholar
[10] Tikoo, M., A note on H-sets. Kyungpook Math. J. 28(1988), no. 1, 9195.Google Scholar
[11] Veličko, N. V., H-closed topological spaces. Amer. Math. Soc. Transl. 78(1968), 103 118.Google Scholar
[12] Vermeer, J., Closed spaces of H-closed spaces. Pacific J. Math. 118(1985), no. 1, 229247.Google Scholar