منابع مشابه
Strongly k-spaces
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The problem of Y. Tanaka [10] of characterizing the topologies whose products with each first-countable space are sequential, is solved. The spaces that answer the problem are called strongly sequential spaces in analogy to strongly Fréchet spaces.
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A space X is said to be strongly base-paracompact if there is a basis B for X with |B| = w(X) such that every open cover of X has a star-finite open refinement by members of B. Strongly paracompact spaces which are strongly base-paracompact are studied. Strongly base-paracompact spaces are shown have a family of functions F with cardinality equal to the weight such that every open cover has a l...
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ژورنال
عنوان ژورنال: Chinese Annals of Mathematics, Series B
سال: 2018
ISSN: 0252-9599,1860-6261
DOI: 10.1007/s11401-018-0109-1