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- W2013076319 abstract "The theta-closed hull of a set A in a topological space is the smallest set C containing A such that, whenever all $closed$ neighborhoods of a point intersect C, this point is in C. We define a new topological cardinal invariant function, the $theta-bitighness small number$ of a space X, bts_theta(X), and prove that in every topological space X, the cardinality of the theta-closed hull of each set A is at most |A|^{bts_theta(X)}. Using this result, we synthesize all earlier results on bounds on the cardinality of theta-closed hulls. We provide applications to P-spaces and to the almost-Lindelof number." @default.
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- W2013076319 date "2012-03-26" @default.
- W2013076319 modified "2023-09-26" @default.
- W2013076319 title "On the cardinality of the $theta$-closed hull of sets" @default.
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