*定義 [#pc8de385]
In topological spaces, a subset A is called gs-open (generalized semiopen) if for every closed set F, the [[semiinterior]] of A contains F whenever A contains F.

*参考 [#nd3b0ac0]
R. Devi, K. Balachandran and H. Maki, ''Semigeneralized closed and generalized closed maps'', Mem. Fac. Sci. Kochi Univ. Ser.A (Maths), 14 (1993), 41-54.