## 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

### Keywords:

dense $$G_ \delta$$-diagonal