Some applications of Henderson’s open embedding theorem of -manifolds
Baire spaces
CONTENTSIntroduction............................................................................................................ 5I. Basic properties of Baire spaces................................................................... 61. Nowhere dense sets............................................................................................... 62. First and second category sets............................................................................. 83. Baire spaces................................................................................................................
The Freudenthal compactification
CONTENTS1. Introduction...................................................52. ℬ-filters and ℬ-compactifications..................63. The weight of φX.........................................124. Other properties of φX................................155. Extensions of maps and subspaces............216. Subordinate subsets of C*(X)......................257. Quasi-component spaces...........................308. References.................................................33
Relations approximated by continuous functions in the Vietoris topology
Let X be a Tikhonov space, C(X) be the space of all continuous real-valued functions defined on X, and CL(X×ℝ) be the hyperspace of all nonempty closed subsets of X×ℝ. We prove the following result: Let X be a locally connected locally compact paracompact space, and let F ∈ CL(X×ℝ). Then F is in the closure of C(X) in CL(X×ℝ) with the Vietoris topology if and only if: (1) for every x ∈ X, F(x) is nonempty; (2) for every x ∈ X, F(x) is connected; (3) for every isolated x ∈ X, F(x) is a singleton...
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