On special operations on Ω-closeness on topological spaces

摘要

In this paper, the concepts of Ω~*-closed and Ω~*-continuous maps are introduced and several properties of them are investigated. These concepts are used to obtain several results concerning the preservation of Ω-closed sets. Moreover, we use Ω~*-closed and Ω~*-continuous maps to obtain a characterization of semi-T_(1/2) spaces.