Miguel Caldas Cueva

048. A new characterization for a topological space to be semi-T_1/2

Math. Journal: Comptes Rendus de L’Academie Bulgare de Sciences, Bulgaria.  54(2001), 5-6.
Authors: Caldas, M.

Abstract
A topological space $(X,\tau)$  is semi-$T_{1/2}$ if and only if, every subset of X is  $\tau$-semi-closed.