Existence of positive periodic solutions for fourth-order nonlinear neutral differential equations with variable delay

Abstract

In this article we study the existence of positive periodic solutions for a fourth-order nonlinear neutral differential equation with variable delay. The main tool employed here is the Krasnoselskii's fixed point theorem dealing with a sum of two mappings, one is a contraction and the other one is completely continuous.

Keywords

• positive periodic solutions
• nonlinear neutral differential equations
• fixed point theorem
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