Definition
- A topological space (X,τ) is said to be T_{UB} if for each x of X and , M compact such that , either {x} is weakly separated from M or M is weakly separated from {x}.
Property
- T_{UB} implies T_F and if the space is compact, then T_{UB} ⇒ T_D.
Reference
- Singal, Asha Rani, Remarks on separation axioms. (English) [A] General Topology Relations modern Analysis Algebra, Proc. Kanpur topol. Conf. 1968, 265-296 (1971).