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Unified operation approach of generalized closed sets via topological ideals. (English) Zbl 0991.54043

Summary: The aim of this paper is to unify the concepts of topological ideals, operation functions (= expansions) and generalized closed sets.

MSC:

54H05 Descriptive set theory (topological aspects of Borel, analytic, projective, etc. sets)
54C08 Weak and generalized continuity
54D10 Lower separation axioms (\(T_0\)–\(T_3\), etc.)
54C10 Special maps on topological spaces (open, closed, perfect, etc.)
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