DEFINITION BANK in Fuzzy Topology is a nice collection of all existing definitions (particularly - weaker forms) w.r.t. fuzzy open sets, fuzzy closed sets, fuzzy mappings(=fuzzy functions), fuzzy separation axioms and their generalized weak forms . Also, it includes some of the newest...

A subset A of a topological space is called preopen if ⊂ . The complement of a preopen set is called preclosed set . In the literature preopen sets have been utilized to characterize separation axioms and functions. The aim of this paper is to study some more characterizations of pre-Urysohn...

In this note we introduce the new concepts like semipre-neighbourhoods(i.e.sp-nbds),semipreinterior (i.e.,sp-interior)point, semipre-limit point(i.e.,sp-limit point), semi prederived (sp-derived)set and semiprefrontier (sp-frontier)of a set using the conecept of semipreopen sets and obtain their...