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Multiple solutions of second-order ordinary differential equation via morse theory

机译:基于莫尔斯理论的二阶常微分方程的多重解

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摘要

In this paper, we consider the the second-order ordinary differential equation with periodic boundary problem -?(t) = f(t, x(t)), subject to x(0) - x(2π) = x?(0) - x?(2π) = 0, where f: C(, 2π] X R, R). The operator K = (- ~(d2/sup>) dt ~2)+I) ~(-1) an important role. By using Morse index, Leray-Schauder degree and Morse index theorem of the type Lazer-Solimini, we obtain that the equation has at least two or three nontrivial solutions without assuming nondegeneracy of critical points and has at least four nontrivial solutions assuming nondegeneracy of critical points.
机译:在本文中,我们考虑具有周期边界问题-?(t)= f(t,x(t))的二阶常微分方程,服从x(0)-x(2π)= x?(0 )-x?(2π)= 0,其中f:C(,2π] XR,R)。算子K =(-〜(d2 / sup>)dt〜2)+ I)〜(-1)起重要作用。通过使用Lazer-Solimini类型的Morse指数,Leray-Schauder度和Morse指数定理,我们得出该方程至少具有两个或三个非平凡的解,而不假设临界点的简并性,并且至少具有四个非平凡的解,假设临界点的简并性点。

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