具有Bula属性的开放地图
Open maps having the Bula property
摘要:
每个从空间X到仿紧C-空间Y的开连续映射f都允许X的两个不交闭子集,使得它们在f上的像是Y,条件是f的所有纤维都是无限的且C*-嵌入X。应用证明了集值最小二乘的“不相交”usco多重选择的存在性。仿紧C-空间上的开连续映射,以及从可度量化空间到仿紧C-空间上的开连续映射的特殊类型的因子分解。这解决了几个悬而未决的问题。
英文摘要:
Every open continuous map f from a space X onto a paracompact C-space Y admits two disjoint closed subsets of X so that their image by f is Y provided all fibers of f are infinite and C*-embedded in X. Applications are demonstrated for the existence of "disjoint" usco multiselections of set-valued l.s.c. mappings defined on paracompact C-spaces, and for special type of factorizations of open continuous maps from metrizable spaces onto paracompact C-spaces. This settles several open questions.
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