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The purpose of this paper is to introduce the concept of an operation on a class of P S -open subsets of topological spaces. Using this operation, we define the concept of S P -open sets, and study some of their related topological properties. Furthermore, some separation axioms by utilizing the operation on P S O(X) and the set S P -open have been investigated.doi:10.25271/2016.4.2.88 fatcat:5yqshzb5gvg3xmfevysae6teiy