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Existence and multiplicity of periodic solution for non-autonomous second-order systems with linear nonlinearity. (English) Zbl 1087.34022

The purpose of this paper is to study the existence and multiplicity of periodic solution for the following nonautonomous second-order systems \[ \ddot u(t)=\nabla F\bigl(t,u(t)\bigr)\text{ a.e. } t\in [0,T],\quad u(0)-u(T)=\dot u(0)-\dot u(T)=0. \] Some new existence and multiplicity theorems are obtained by using least action principle and the minimum method.

MSC:

34C25 Periodic solutions to ordinary differential equations
34B15 Nonlinear boundary value problems for ordinary differential equations
37J45 Periodic, homoclinic and heteroclinic orbits; variational methods, degree-theoretic methods (MSC2010)
47J30 Variational methods involving nonlinear operators
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