semi-Difference set

Last-modified: 2010-11-28 (日) 18:06:56

Definition

  • A subset S of a topological space (X,τ) is called a semi-Difference set (in short sD-set) if there are two semi-open sets U, V in X such that imgtex.fcgi?%5bres=100%5d%7b%5c%5b%20U%5cneq%20X%20%5cmbox%7b%20and%20%7dS=U%5csetminus%20V%20%5c%5d%7d%25.png .

Reference

  • Athisaya Ponmani, S.; Lellis Thivagar, M., Another form of separation axioms. , (English) [J] Methods Funct. Anal. Topol. 13, No. 4, 380-385 (2007).