On contra (δ, gδ)‎–continuous functions

Abstract EN

In 1980 T .

Naira introduce δ – sets to define a new class of functions called δ–continuous and in 1996 Ditched and Ganster introduce and studied a new class of sets called δ–generalized closed and in 2000 Ditched and others introduce g δ– closed sets.

In this paper we use these sets to define and study a new type of functions called contra (δ, g δ)–continuous as a new type of contra continuous the functions contra δ–continuous is stronger than contra continuous function ,contra g δ – continuous functions and weaker than Rc–continuous and each one of them are independent with (δ, g δ) - continuous functions.

Preservation theorems of this functions are investigated also several properties concerning this functions are obtain .

The relationships between the δ –closed set with the other sets that have so important to get many results are investigated .

finally we study the relationships between this functions with the other functions .