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In this paper we study the existence of infinitely many periodic solutions for second-order Hamiltonian systems $\left\{ {\begin{array}{*{20}c} {\ddot u(t) + A(t)u(t) + \nabla F(t,u(t)) = 0,} \\ {u(0) - u(T) = \dot u(0) - \dot u(T) = 0,} \\ \end{array} } \right. $ , where F(t, u) is even in u, and ∇F(t, u) is of sublinear growth at infinity and satisfies the Ahmad-Lazer-Paul condition.
Acta Mathematicae Applicatae Sinica – Springer Journals
Published: Apr 5, 2016
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