%0 Journal Article %A Klaas Pieter Hart %T Spaces for which the diagonal has a closed neighborhood base %J Colloquium Mathematicum %D 1987 %P 49-56 %V 53 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-53-1-49-56/ %R 10.4064/cm-53-1-49-56 %G en %F 10_4064_cm_53_1_49_56