λ-T_2

Definition

• A topological space (X,τ) is said to be λ-T_2 if for any x, y ∈ X such that there
  exist disjoint λ-open sets U and V such that x ∈ U and y ∈ V.

Property

• λ_T_2 ⇒ λ-D_2.
• λ_T_2 ⇒ λ-T_1.

Reference

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