Nettet322 Thai J. Math. 11 (2013)/ A.B. Khalaf and N.K. Ahmed Proposition 2.2. A subset A of a topological space (X,τ) is Sβ-open set if and only if A is semi open and it is a union of β-closed sets. Proof. Obvious. The following result shows that any union of Sβ-open sets in a topological space is Sβ-open. Theorem 2.3. http://cucurbitgenomics.org/feature/mRNA/Csa3G836520.2

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