17 citations · 43 across the 41 of their papers we have counts for
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A Generalized Mountain Pass Lemma with a Closed Subset for Locally Lipschitz Functionals
Fengying Li, Bingying Li, Shiqing Zhang
The classical Mountain Pass Lemma of Ambrosetti-Rabinowitz has been studied, extended and modified in several directions. Notable examples would certainly include the generalizatio…
Notes on a Theorem of Benci-Gluck-Ziller-Hayashi
Fengying Li, Shiqing Zhang
We use constrained variational minimizing methods to study the existence of periodic solutions with a prescribed energy for a class of second order Hamiltonian systems with a …
Periodic Solutions of Non-Autonomous Second Order Hamiltonian Systems
Fengying Li, Shiqing Zhang, Xiaoxiao Zhao
We try to generalize a result of M. Willem on forced periodic oscillations which required the assumption that the forced potential is periodic on spatial variables. In this paper,…
Hyperbolic Orbits for a Class of Singular Hamiltonian Systems with Repulsive Potentials
Donglun Wu, Shiqing Zhang
The existence of hyperbolic orbits is proved for a class of singular Hamiltonian systems with repulsive potentials by taking limit for a sequence of periodic solutions which are th…
Hyperbolic Orbits for a Class of Singular Hamiltonian Systems
Donglun Wu, Shiqing Zhang
The existence of hyperbolic orbits is proved for a class of singular Hamiltonian systems by taking limit for a sequence of periodic solutions which a…
Twisted Angles for Central Configurations Formed By Two Twisted Regular Polygons
Yu Xiang, Zhang Shiqing
In this paper, we study the necessary conditions and sufficient conditions for the twisted angles of the central configurations formed by two twisted regular polygons, specially, w…