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The Kuratowski closure-complement problem. (English) Zbl 0735.54001

The author presents an easily readable proof of the famous Kuratowski closure-complement problem, similar to, but not identical with Kuratowski’s original [C. Kuratowski, Sur l’opĂ©ration A de l’analysis situs, Fundam. Math. 3, 182-199 (1922)].

MSC:

54A05 Topological spaces and generalizations (closure spaces, etc.)
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