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Some remarks on the critical point theory
Li, Chong
AbstractIn this paper we discuss some problems about critical point theory. In the first part of the paper we study existence and multiplicity results of semilinear second order elliptic equation: [GRAPHICS] In [4], the authors study the contractibility of level sets of functionals associated with some elliptic boundary value problems. In this paper by using Morse theory and minimax method we give a more precise description of topological construction of level set of critical value of energy functional for mountain pass type critical point. It is well known that nondegenerate critical point is isolated, so if a critical point is not isolated, it must be a degenerate critical point. In the second part we will give an example that all the critical points of functional of a class of oscillating equation with Neumann boundary condition are isolated and the equation has only constant solutions. Moreover, critical groups of each critical point of the functional are trivial. The elliptic sine-Gordon equation originates from the static case of the hyperbolic sine-Gordon equation modelling the Josephson junction in superconductivity, which is of contemporary interest to physicists. The problem is similar to the elliptic sine-Gordon equation so we believe that it derives from profound physical backdrop.
Keywordmountain pass theorem order intervals Morse theory minimax method
WOS Research AreaMathematics
WOS SubjectMathematics
WOS IDWOS:000251939000002
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Document Type期刊论文
Corresponding AuthorLi, Chong
AffiliationAcad Sinica, AMSS, Inst Math, Beijing 100080, Peoples R China
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GB/T 7714
Li, Chong. Some remarks on the critical point theory[J]. TOPOLOGICAL METHODS IN NONLINEAR ANALYSIS,2007,30(2):223-234.
APA Li, Chong.(2007).Some remarks on the critical point theory.TOPOLOGICAL METHODS IN NONLINEAR ANALYSIS,30(2),223-234.
MLA Li, Chong."Some remarks on the critical point theory".TOPOLOGICAL METHODS IN NONLINEAR ANALYSIS 30.2(2007):223-234.
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