THE κ-QUOTIENT IMAGES OF METRIC SPACES
نویسندگان
چکیده
منابع مشابه
On Quotient Π-images of Locally Separable Metric Spaces
We prove that a space is quotient π-image of a locally separable metric space if and only if it has a πand double cs∗cover. We also investigate quotient π-s-images of locally separable metric spaces.
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In this paper, we prove that sequence-covering, π-images of metric spaces and spaces with a σ-strong network consisting of fcs-covers are equivalent. We also investigate π-images of separable metric spaces.
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We introduce the notion of an ls-π-Ponomarev-system to give necessary and sufficient conditions for f : (M,M0) → X to be a strong wcmapping (wc-mapping, wk-mapping) where M is a locally separable metric space. Then, we systematically get characterizations of weakly continuous strong wc-images (wc-images, wk-images) of locally separable metric spaces by means of certain networks. Also, we give c...
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In 1966, Michael [11] introduced the concept of compact-covering maps. Since many important kinds of maps are compact-covering, such as closed maps on paracompact spaces, much work has been done to seek the characterizations of metric spaces under various compact-covering maps, for example, compact-covering (open) s-maps, pseudosequence-covering (quotient) s-maps, sequence-covering (quotient) s...
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We prove that a space is a sequentially-quotient (pseudo-sequencecovering), π-image of a separable metric space if and only if it has a point-star network consisting of countable-cs∗-covers. We also investigate spaces with count-
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ژورنال
عنوان ژورنال: Communications of the Korean Mathematical Society
سال: 2012
ISSN: 1225-1763
DOI: 10.4134/ckms.2012.27.2.377