【摘要】 研究非自治时滞微分方程组 x′(t) =a1 (t)x(t) -λh1 (t)f(x(t-δ1 (t) ) ,y(t-τ1 (t) ) ) ,y′(t) =-a2 (t)y(t) +μh2 (t)f(x(t-δ2 (t) ) ,y(t-τ2 (t) ) ) .给出了保证方程组存在正周期解的充分条件。更多还原

【Abstract】 The existence of positive periodic solutions of non-autonomous functional differential systems x′(t)=a 1(t)x(t)-λh 1(t)f(x(t-δ 1(t)),y(t-τ 1(t))), y′(t)=-a 2(t)y(t)+μh 2(t)f(x(t-δ 2(t)),y(t-τ 2(t))). is investigated.It is shown that under reasonable conditions,there exists positive periodic solutions for every λ>0, μ>0.更多还原