Weak forms of ω-open sets and weak forms of ω-continuity

الملخص EN

The aim of this paper is to introduce and study several weak forms of co -open sets.

A set A ≤ X is pre- co -open set (resp.

a-ω-open, β-ω-open and b-ω-open) if A ≤ intω (cl(A)) (resp, A ≤ c l/(intω cl((A))), A ≤ intω (cl(A))∪ cl(intω (A))) Moreover, several characterizations of semi-ω-open sets are provided and some constructions and applications via pre-ω-open, a-ω-open, A- ω-open and β-ω-open sets are discussed.