A topological space is called consonant if, on the set of all closed subsets of X, the co-compact topology coincides with the upper Kuratowski topology. For a filter F on the set of natural numbers Ο, let X F = Ο βͺ {β} be the space for which all points in Ο are isolated and the neighborhood system o
P-filters and hereditary Baire function spaces
β Scribed by Witold Marciszewski
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 422 KB
- Volume
- 89
- Category
- Article
- ISSN
- 0166-8641
No coin nor oath required. For personal study only.
β¦ Synopsis
We extend the results of Gul'ko and Sokolov proving that a filter F on w, regarded as a subspace of the Cantor set 2", is a hereditary Baire space if and only if F is a nomneager (i.e., second category) P-filter. We also prove related results on hereditary Baire spaces of continuous functions C,(X).
π SIMILAR VOLUMES
A space X is called a t-image of Y if C,(X) is homeomorphic to a subspace of C,(Y). We prove that if Y is a t-image of X, then Y is a countable union of images of X under almost lower semicontinuous finite-valued mappings (see Definition 1.4). It follows that if Y is a t-image of X (in particular, i
The aim of this paper is to obtain some characterizations of almost p-normal spaces and mildly p-normal spaces and to improve the preservation theorems of p-normal spaces and mildly p-normal spaces established by Navalagi [Pnormal, almost p-normal and mildly p-normal spaces.
It is proved that a point 4 from the Tech-Stone remainder N\* is a P-point iff C,(N$) is a hereditary Baire space, where II4 = N U (4;). S ome characterizations of P-points in terms of games played in FY4 and C\*(W,) are also given.