研究了一类具有无限时滞和扩散项的非自治竞争系统,利用重合度的廷拓定理,得到了该系统正周期解存在的充分性条件.
By using the continuation theorem of coincidence degree theory, the existence of positive periodic solutions for a kind of nonautonomous competitive system with infinite delay and diffusion is studied. The sufficient conditions are obtained for the existence of positive periodic solutions of the system.