*Definition [#i4a2a0f5]
-A topological space (X,τ) said to be a T_{ES} if every singleton subset of X is either open or closed.

*Property [#v1d499ac]
-T_{ES} ⇒ [[T_D]].
-T_{ES} ⇒ [[T_F]].

*Reference [#ped766dd]
-McSherry, D. M. G. , ''On separation axioms weaker than T_1.'' , Proc. Roy. Irish Acad. Sect. A 74 (1974), 115–118.