Separating sets by functions with a closed graph

Article

Separating sets by functions with a closed graph

Published in: Quaestiones Mathematicae
Volume 40 , issue 5 , 2017 , pages: 623–626
DOI: 10.2989/16073606.2017.1305462
Author(s): Jolanta Kosman Kazimirz Wielki University, Poland
Keywords: Primary 26A21 , 54C30 , Secondary 26A15 , 54C08 , Primary 26A21 , 54C30 , Secondary 26A15 , 54C08
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Abstract

In this paper we characterize the pairs (A−, A+) of disjoint subsets of a perfectly normal topological space which can be separated by a function with a closed graph.
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