Browsing by Author "Guerfi Abderrahim"
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Item Periodicity and positivity of solutions for certain delay functional differential equations by the fixed point technique(Université Badji Mokhtar Annaba, 2022-02-07) Guerfi AbderrahimThis work is devoted to the study of the periodicity, positivity and stability of solutions for some classes of delay functional equations and systems. The method used here is the fixed point theorems for proving the desired results. The idea of this method is based on the converting of the considered equation into an equivalent integral equation and then show the existence, uniqueness and stability of periodic and positive periodic solutions by using the fixed point theorems.