International Journal of Mathematics and Mathematical Sciences
Volume 21 (1998), Issue 1, Pages 205-207
doi:10.1155/S0161171298000295
Abstract
The object of the present paper is to study the well known notions of semi-closure, semiinterior,
semi-frontier and semi-exterior of a set using the concept of semi-open sets. A semi-isolated
point of a set is also defined and studied.