Another type of separation axioms

الملخص

             The main purpose of this paper is to study properties of semi-closed(open) sets s-closed (s-open)sets and generlized -closed(open)sets g-closed(g-open)sets and study the relationship between them.And also inroduce another type of separation axioms called it S- separation axiom and the characteristics that can be prserved of some type of functions on many spaces as  S-T₀ , S-T₁ , S-T₂  and  we explain  that the property of S-T₀ , S-T₁ , S-T₂  are toplological property if the function is injactive and s^*-open .