جۆری توێژینه‌وه‌: Original Article

نوسه‌ران

1 Mathematics Department, College of Science, University of Sulaimani, Kurdistan Region, Iraq.

2 Mathematics Department, College of Education, University of Garmian, Kurdistan- Region, Iraq.

پوخته‌

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 and
pre-interior (point) in topological space are investigated.
 

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