Existence theorems of multiple critical
β
Jingxian Sun; Jinli Sun
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Article
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2005
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Elsevier Science
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English
β 242 KB
In this paper, using the method of invariant sets of descending flow, the multiplicity of critical points of a functional is discussed. A main theorem, which is called chain of rings theorem, is obtained. The theoretical results are applied to nonlinear elliptic boundary value problems and at least