Existence of Periodic Solutions for A Class of Impulsive Delay Functional Differential Equations

Delay functional differential equations have important applications in many fields of modern science and technology, however, the research on the existence of positive periodic solutions for functional differential equations with perturbations is relatively small, so it is necessary to study the existence of periodic solutions of functional differential equations with delay, so as to effectively express and describe the practical problems. In this paper, the existence of periodic solutions for a class of inverse differential equations with time delays and nonlinear perturbations was discussed by using the fixed point theorem, this showed that there was at least one positive periodic solution, and it was applied to the green fly biological model.