*定義 [#k7935296]
In topological spaces, a subset A is called gp-open (generalized preopen) if for every closed set F, the [[preinterior]] of A contains F whenever A contains F.

*参考 [#x89be356]
I. Arokirani, K. Balachandran and Julian Dontchev, ''Some characterizations of gp-irresolute and gp-continuous maps between topological spaces'', Mem. Fac. Sci. Kochi Univ. (Math.) 20(1999), 93-104.