The notion of preopen sets and precontinuity in a topological space was introduced by Mashhour et. al in 1982 . Later the same was studied in a bitopological space in  and . Here we have studied the idea of pairwise preopen sets (semi preopen) and pairwise precontinuity (semi precontinuity) in a more general structure of a bispace and investigate how far several results as valid in a bitopological space are affected in a bispace.
Keywords and Phrases
Bispace, preopen sets, pairwise preopen sets, semi preopen sets, pairwise semi preopen sets, precontinuity, semi precontinuity.
A.M.S. subject classiﬁcation
54A05, 54E55, 54E99.