Definition
A space X is S-closed if every semiopen cover of X has a finite subfamily the closures of whose members cover X.
Reference
T. Thompson, S?closed spaces, Proc. Amer. Math. Soc. 60 (1976), 335-338.
A space X is S-closed if every semiopen cover of X has a finite subfamily the closures of whose members cover X.
T. Thompson, S?closed spaces, Proc. Amer. Math. Soc. 60 (1976), 335-338.