Abstract
Using the concept of preopen set, we introduce and study closure properties of pre-limit points, pre-derived sets, pre-interior and pre-closure of a set, pre-interior points,pre-border, pre-frontier and pre-exterior in closure space. The relations between pre-closure of a set and pre-interior (point) in closure spaces and pre-closure of a set andpre-interior (point) in topological space are investigated.
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