机构地区: 湖南大学数学与计量经济学院
出 处: 《应用数学学报》 2006年第5期821-831,共11页
摘 要: 本文利用变分原理和Z2不变群指标研究了二阶混合型泛函微分方程x"(t-τ)+f(t,x(t),x(t-τ),x(t-2τ))=0和x"(t-r)+λf1(t,x(t),x(t-τ),x(t-2τ))=x(t-τ)多重周期解.得出了有关新结果. By means of variational structure and Z2 group index theory, we obtain multiple periodic solutions to a class of second-order functional differential equations of mixed type x″(t-τ)+f(t,x(t),x(t-τ),x(t-2τ))=0 and x″(t-τ)+λf(t,x(t),x(t-τ),x(t-2τ))=x(t-τ)