Existence and multiplicity of solutions for a fourth-order differential system with instantaneous and non-instantaneous impulses - Xia, Minggang; Zhang, Xingyong; Xie, Junping (Open mathematics (Warsaw, Poland), 2023)
Keywords: 34A37; 49J35; existence; Impulses; instantaneous and non-instantaneous impulse; mountain pass theorem; Mountains; multiplicity; symmetric mountain pass lemma; variational structure