Multiple solutions for nonlinear Neumann problems driven by a nonhomogeneous differential operator
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- by D. Motreanu and N. S. Papageorgiou PDF
- Proc. Amer. Math. Soc. 139 (2011), 3527-3535 Request permission
Abstract:
We consider a nonlinear Neumann problem driven by a nonhomogeneous quasilinear degenerate elliptic differential operator $\operatorname {div} a(x,\nabla u)$, a special case of which is the $p$-Laplacian. The reaction term is a Carathéodory function $f(x,s)$ which exhibits subcritical growth in $s$. Using variational methods based on the mountain pass and second deformation theorems, together with truncation and minimization techniques, we show that the problem has three nontrivial smooth solutions, two of which have constant sign (one positive, the other negative). A crucial tool in our analysis is a result of independent interest which we prove here and which relates $W^{1,p}$ and $C^1$ local minimizers of a $C^1$-functional constructed with the general differential operator $\operatorname {div} a(x,\nabla u)$.References
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Additional Information
- D. Motreanu
- Affiliation: Département de Mathématiques, Université de Perpignan, 66860 Perpignan, France
- Email: motreanu@univ-perp.fr
- N. S. Papageorgiou
- Affiliation: Department of Mathematics, National Technical University, Athens 15780, Greece
- MR Author ID: 135890
- Email: npapg@math.ntua.gr
- Received by editor(s): March 17, 2010
- Received by editor(s) in revised form: July 23, 2010, and August 24, 2010
- Published electronically: February 18, 2011
- Communicated by: Walter Craig
- © Copyright 2011 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 139 (2011), 3527-3535
- MSC (2010): Primary 35J40; Secondary 35J70
- DOI: https://doi.org/10.1090/S0002-9939-2011-10884-0
- MathSciNet review: 2813384