β*-set

Definition

• A subset A of a space (X,τ) is called a β*-set if A = U ∩ V, where U is open and int(V) = cl(int(V)).

Reference

• Açıkgöz, Ahu, On β*g-closed sets and new separation axioms. (English summary), Eur. J. Pure Appl. Math. 4 (2011), no. 1, 20-33.