A new existence theory for positive periodic solutions to functional differential equations with impulse effects
The principle of this paper is to deal with a new existence theory for positive periodic solutions to a kind of nonautonomous functional differential equations with impulse actions at fixed moments. Easily verifiable sufficient criteria are established. The approach is based on the fixed-point theorem in cones. The paper extends some previous results and obtains some new results. (c) 2006 Elsevier Ltd. All rights reserved.
existence positive periodic solution functional differential equation impulse fixed-point theorem