Definition
- A topological space (X,τ) is called semi-D_1 if for , there exists a sD-sets of X one containing x but not y and the other containing y but not x.
Property
- If (X,τ) is semi-D_1, then it is semi-D_0.
Reference
- Athisaya Ponmani, S.; Lellis Thivagar, M., Another form of separation axioms. , (English) [J] Methods Funct. Anal. Topol. 13, No. 4, 380-385 (2007).