λ-D_0

Definition

• A topological space (X,τ) is said to be λ-D_0 if for x, y ∈ X such that there exists an λ-D-set of X containing x but not y or a λ-D-set containing y but not x .

Reference

• Caldas Miguel, Jafari Saeid, Navalagi Govindappa, More on λ-closed sets in topological spaces.,Rev. Colombiana Mat. 41 (2007), no. 2, 355-369.