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- W2009060894 abstract "The notions of an Sδ set and an Rδ set are introduced. A space is S-perfect (R-perfect) if each closed set is an Sδ set (Rδ) set. Conditions are given which indicate when spaces are S-perfect or R-perfect. Examples are given of spaces which do not have these properties and examples are given of spaces with these properties that are not perfect spaces. The images of S-perfect and R-perfect spaces under various types of mappings are investigated." @default.
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- W2009060894 date "1989-11-01" @default.
- W2009060894 modified "2023-10-18" @default.
- W2009060894 title "On two classes of sets containing all Baire sets and all co-analytic sets" @default.
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- W2009060894 doi "https://doi.org/10.1016/0166-8641(89)90106-5" @default.
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