Document Type : Research Paper

Authors

• P. Nasertayoob
• S. M. Vaezpour

Dept. of Math., Amirkabir University of Technology (Polytechnic), Hafez Ave., P. O. Box 15914, Tehran, Iran.

Abstract

In this paper, sufficient conditions are investigated for the existence of periodic (not necessarily positive) solutions for nonlinear several time delay population system with feedback control. Nonlinear system affected by an periodic external source is studied. Existence of a control variable provides  the extension of  some previous results obtained in other studies. We give a illustrative example in order to indicate the validity of the assumptions.

Keywords

• Schauder's fixed-point theorem
• Periodic solution
• Population equation
• Feedback control