Positive periodic solution of a periodic cooperative model with state dependent delays

摘要

By using the continuation theorem of coincidence degree theory, sufficient conditions are obtained for the existence of positive periodic solution for the periodic cooperative system with state dependent delays. Our purpose in this article is by suing the Mawhin’s continuation theorem to show the existence of at least one positive periodic solution of System. For the work concerning the existence of a periodic solution of delay differential equations, which was done by using coincidence degree theory, we refer to [5-7] and references cited therein.