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Proyecciones (Antofagasta)

Print version ISSN 0716-0917

Proyecciones (Antofagasta) vol.39 no.2 Antofagasta Apr. 2020 


On stability functional differential equation with delay variable by using fixed point-theory

1University of Duhok, College of Basic Education, Dept.of Mathematics, Zakho, Iraq. e-mail:


I will explain how to use the Banach fixed point theory in the asymptotic stability of nonlinear differential equations; I will obtain appropriate generalizations and strong forms of some of the results in [2, 3, 5, 6, 10, 11, 12,13].

Specifically, in the above-mentioned paper, asymptotic stability is achieved, while I will discuss how to achieve a asymptotic stability as well as stability by making a simple observation, also circulate the previous asymptotic stability results to the Functional Differential Equations systems, not only on the scalar Functional Differential Equations as is the case in the mentioned paper.

This raises the question of how much this particular method can afford us, and what are the limitations of this technique. I will refer to the important limitation of the fixed point theory on the uniqueness of solutions only within the complete metric space area where they are not specified. If the metric space onto which the contraction mapping principle is applied is very small, i do not get a satisfactory result. I will discuss this in detail below.

Keywords: Nonlinear; Asymptotical stability; Banach fixed point theorem; Delayed functional differential equation

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Received: October 30, 2018; Accepted: January 30, 2020

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