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Bella, Angelo; Bonanzinga, Maddalena; Matveev, Mikhail
Central European journal of mathematics, 2013/3, Letnik: 11, Številka: 3Journal Article
A space X is sequentially separable if there is a countable D ⊂ X such that every point of X is the limit of a sequence of points from D . Neither “sequential + separable” nor “sequentially separable” implies the other. Some examples of this are presented and some conditions under which one of the two implies the other are discussed. A selective version of sequential separability is also considered.
