TAILIEUCHUNG - EXISTENCE OF INFINITELY MANY NODAL SOLUTIONS FOR A SUPERLINEAR NEUMANN BOUNDARY VALUE PROBLEM AIXIA

EXISTENCE OF INFINITELY MANY NODAL SOLUTIONS FOR A SUPERLINEAR NEUMANN BOUNDARY VALUE PROBLEM AIXIA QIAN Received 12 January 2005 We study the existence of a class of nonlinear elliptic equation with Neumann boundary condition, and obtain infinitely many nodal solutions. The study of such a problem is based on the variational methods and critical point theory. We prove the conclusion by using the symmetric mountain-pass theorem under the Cerami condition. 1. Introduction Consider the Neumann boundary value problem: − u + αu = f (x,u), ∂u = 0, ∂ν x ∈ Ω, () x ∈ ∂Ω, where Ω ⊂ RN (N ≥ 1) is a bounded domain. | EXISTENCE OF INFINITELY MANY NODAL SOLUTIONS FOR A SUPERLINEAR NEUMANN BOUNDARY VALUE PROBLEM AIXIA QIAN Received 12 January 2005 We study the existence of a class of nonlinear elliptic equation with Neumann boundary condition and obtain infinitely many nodal solutions. The study of such a problem is based on the variational methods and critical point theory. We prove the conclusion by using the symmetric mountain-pass theorem under the Cerami condition. 1. Introduction Consider the Neumann boundary value problem -Au au f x u x e Q du n 0 x e dQ dv where Q c RN N 1 is a bounded domain with smooth boundary dQ and a 0 is a constant. Denote by ơ -A Aị I 0 A1 A2 Xk . the eigenvalues of the eigenvalue problem -Au Xu x e Q du n 0 x e dQ. dv Let F x s Ị0 f x t dt G x s f x s s - 2F x s . Assume f1 f e C Q X R f 0 0 and for some 2 p 2 2N N - 2 for N 1 2 take 2 oo c 0 such that I f x u I c 1 u p-1 x u e Q X R. f2 There exists L 0 such that f x s Ls is increasing in s. f3 lim spo f x s s s 2 o uniformly for . x e Q. Copyright 2006 Hindawi Publishing Corporation BoundaryValue Problems 2005 3 2005 329-335 DOI 330 Infinitely many nodal solutions for a Neumann problem f4 There exist 0 1 s e 0 1 such that 0G x t G x st x u e Q X R. f5 f x -t -f x t x u e Q X R. Because of f3 is called a superlinear problem. In 6 Theorem the author obtained infinitely many solutions of under fi - f5 and AR 3p 2 R 0 such that x e Q s R 0 pF x s f x s s. Obviously f3 can be deduced from AR . Under AR the PS sequence of corresponding energy functional is bounded which plays an important role for the application of variational methods. However there are indeed many superlinear functions not satisfying AR for example take 0 1 the function f x t 2t log 1 t while it is easy to see that the above function satisfies f1 - f5 . Condition f4 is from 2 and is from 4 . In view of the variational point solutions of are critical points of .

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