(Λ,sδ)-property

Definition

• A topological space (X,τ) satisfies the (Λ,sδ)-property if for any distinct pair of points in X, there is a (Λ,sδ)-open set containing one of the points but not the other.

Reference

• Caldas, M.; Ganster, M.; Georgiou, D. N.; Jafari, S.; Moshokoa, S. P., δ-semiopen sets in topology. (English summary), Proceedings of the 19th Summer Conference on Topology and its Applications., Topology Proc. 29 (2005), no. 2, 369–383.