Positive periodic solutions for an integrodifferential model of mutualism Original Research Article

Sufficient conditions are obtained for the existence of positive periodic solutions of the following integrodifferential model of mutualism: where ri, Ki, αi, σi, i = 1,2 are positive continuous ω-periodic functions, αi > Ki, i = 1, 2, Ji ϵ C([0, ∞], [0, ∞)), and ∫∞0Ji(s) ds = 1, i = 1, 2.