• SEMI - PRE R1 AND WEAKLY SEMI-PRE R0 SPACES

I n this paper we introduce sp-R 1 and weakly –sp- R 0 space with the help of semi-preopen sets defined by Andrijevic / [1]. Semi-pre θ-closure of a set is defined and used to investigate basic properties of sp-R 1 space. Some results on invariance and productivity of   weakly - sp- R 0 spaces have been obtained.