Existence of multiple periodic solutions for delay Lotka–Volterra competition patch systems with harvesting

In this paper, we establish some new and interesting sufficient conditions on the existence of multiple positive periodic solutions for a delay Lotka–Volterra competition patch system with harvesting. Our method is based on Mawhin’s coincidence degree and some novel techniques for defining the operator N(u,λ)N(u,λ) and obtaining a priori bounds.