semi-generalized open

Definition

• Let (X, τ) be a topological space. A subset B ⊆ X is called semi-generalized open if the complement X-B is a semi-generalized closed set.

Remark

• semi-generalized open and generalized open? are, in general, independent.

Reference

• Bhattacharyya Paritosh, Lahiri B. K., Semigeneralized closed sets in topology., Indian J. Math. 29 (1987), no. 3, 375-382 (1988).