Definition
- A topological space (X,τ) is called semi-D_0 if for , there exists a sD-set of X containing one of x and y but not the other.
Reference
- Athisaya Ponmani, S.; Lellis Thivagar, M., Another form of separation axioms. , (English) [J] Methods Funct. Anal. Topol. 13, No. 4, 380-385 (2007).