Closure-preserving families of compact sets
β Scribed by H.B. Potoczny
- Publisher
- Elsevier Science
- Year
- 1973
- Weight
- 750 KB
- Volume
- 3
- Category
- Article
- ISSN
- 0016-660X
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β¦ Synopsis
In [ 31, Tamano raised the question of whether or not a space which admits a closurepreserving cova'r of compact sets is nzce:ssari!y paracon+:t.
b cn~~etexamplc to this oonjectuse was given in 161: a completely rqular 1'2 space having a t losIre-preserving cover by compact sets (in fact, by finite sets) which 'Cails to be paracompact or even normal. It is the purpf3se of this paper to show that if X is a a.;lle:ctionwi~norma! T1 space which admits such a cover, then X is pwacompact.
π SIMILAR VOLUMES
Let K be an algebraically closed field of characteristic zero, endowed with a complete nonarchimedean norm. Let X be a K-rigid analytic variety and βΊ a semianalytic subset of X. Then the closure of βΊ in X with respect to the canonical topology is again semianalytic. The proof uses embedded resolutio
Suppose that any t members (t 2) of a regular family on an n element set have at least k common elements. It is proved that the largest member of the family has at least k 1Γt n 1&1Γt elements. The same holds for balanced families, which is a generalization of the regularity. The estimate is asympto