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On a dense \(G_{\delta{}}\)-diagonal. (English) Zbl 0769.54024

Summary: Topological spaces are studied whose diagonal contains a dense set which is a \(G_ \delta\)-set in \(X\times X\).

MSC:

54D30 Compactness
54D15 Higher separation axioms (completely regular, normal, perfectly or collectionwise normal, etc.)
54E50 Complete metric spaces
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