【摘要】 运用锥拉伸与锥压缩不动点定理和拓扑度理论研究了一类与一阶导函数有关的二阶奇性混合边值问题正周期解的存在性 .更多还原

【Abstract】 The existence of positive periodic solutions for a class of nonlinear boundary value problems were studied. Several sufficient were given by a fixed point theorem on cones.更多还原