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Infinitely many solutions for equations of p(x)-Laplace type with the nonlinear Neumann boundary condition

Published online by Cambridge University Press:  24 August 2017

Eun Bee Choi
Affiliation:
Department of Mathematical Sciences, Seoul National University, Seoul 151-742, Republic of Korea (eunbee@snu.ac.kr)
Jae-Myoung Kim
Affiliation:
Department of Mathematics, Seoul National University, Seoul 151-742, Republic of Korea (cauchy02@naver.com)
Yun-Ho Kim*
Affiliation:
Department of Mathematics Education, Sangmyung University, Seoul 110-743, Republic of Korea (kyh1213@smu.ac.kr)
*
*Corresponding author.
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Abstract

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We investigate the following nonlinear Neumann boundary-value problem with associated p(x)-Laplace-type operator

where the function φ(x, v) is of type |v|p(x)−2v with continuous function p: (1,) and both f : Ω × ℝ and g : ∂Ω × ℝ satisfy a Carathéodory condition. We first show the existence of infinitely many weak solutions for the Neumann problems using the Fountain theorem with the Cerami condition but without the Ambrosetti and Rabinowitz condition. Next, we give a result on the existence of a sequence of weak solutions for problem (P) converging to 0 in L-norm by employing De Giorgi's iteration and the localization method under suitable conditions.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 2018