Free topological groups of weak P-spaces
β Scribed by Warren Wm. McGovern
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 55 KB
- Volume
- 112
- Category
- Article
- ISSN
- 0166-8641
No coin nor oath required. For personal study only.
β¦ Synopsis
It is known that the free topological group over the Tychonoff space X, denoted F (X), is a Pspace if and only if X is a P -space. This article is concerned with the question of whether one can characterize when F (X) is a weak P -space, that is, a space where all countable subsets are closed. Our main result is that F (X) is a weak P -space if and only if X is a weak P -space and every countable subset is C-embedded.
π SIMILAR VOLUMES
We prove that if X is a Tychonoff topological space, Y a subspace of X, and every bounded continuous pseudometric on Y can be extended to a continuous pseudometric on X, then the free topological group F M (Y ) coincides with the topological subgroup of F M (X) generated by Y . For this purpose, a n
We prove that for a metrizable space X the following are equivalent: (i) the free Abelian topological group A(X) is the inductive limit of the sequence {A n (X): n β N}, where A n (X) is formed by all words of reduced length n; (ii) X is locally compact and the set of all non-isolated points of X is
Given a completely regular space X with two uniformities b/I and/-/r both generating the original topology of X, we consider the question wbeth~ there exists a Hausdofff topological group G comaining X as a subspace such that \*Vlx = b/~ and V\* Ix = b/r, where \*~ and ~;\* are respectively the left