对于一个二阶哈密顿系统ü-L(t)u(t)-W(t,u(t))=0,t∈R,通过用局部环绕引理,得到至少两个非平凡的同宿轨道,其中W(t,u)是超二次的。%For a class of the second order Hamiltonian systems ü-L(t)u(t)-W(t,u(t))=0,t∈R, by using the local linking lemma,the existonce of at least two nontrivial homoclinic orbits is obtained,where W(t,u)is superquadratic.
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