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A priori bounds and multiplicity of positive solutions for p-Laplacian Neumann problems with sub-critical growth

Part of: Partial differential equations Elliptic equations and systems

Published online by Cambridge University Press:  23 January 2019

Alberto Boscaggin ,
Francesca Colasuonno  and
Benedetta Noris
Alberto Boscaggin
Affiliation:
Dipartimento di Matematica, Università di Torino, via Carlo Alberto 10, 10123Torino, Italia (alberto.boscaggin@unito.it)
Francesca Colasuonno
Affiliation:
Dipartimento di Matematica, Alma Mater Studiorum Università di Bologna, piazza di Porta S. Donato 5, 40126Bologna, Italia (francesca.colasuonno@unibo.it)
Benedetta Noris
Affiliation:
Laboratoire Amiénois de Mathématique Fondamentale et Appliquée, Université de Picardie Jules Verne, 33 rue Saint- Leu, 80039 AMIENS, France (benedetta.noris@u-picardie.fr)
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Abstract

Let 1 < p < +∞ and let Ω ⊂ ℝN be either a ball or an annulus. We continue the analysis started in [Boscaggin, Colasuonno, Noris, ESAIM Control Optim. Calc. Var. (2017)], concerning quasilinear Neumann problems of the type

$-\Delta _pu = f(u),\quad u > 0\,{\rm in }\,\Omega ,\quad \partial _\nu u = 0\,{\rm on }\,\partial \Omega .$
We suppose that f(0) = f(1) = 0 and that f is negative between the two zeros and positive after. In case Ω is a ball, we also require that f grows less than the Sobolev-critical power at infinity. We prove a priori bounds of radial solutions, focussing in particular on solutions which start above 1. As an application, we use the shooting technique to get existence, multiplicity and oscillatory behaviour (around 1) of non-constant radial solutions.

Keywords

quasilinear elliptic equationsshooting methoda priori estimatesexistence and multiplicityNeumann boundary conditions

MSC classification

Primary: 35J92: Quasilinear elliptic equations with $p$-Laplacian
Secondary: 35A24: Methods of ordinary differential equations 35B05: Oscillation, zeros of solutions, mean value theorems, etc. 35B09: Positive solutions 35B45: A priori estimates
Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh Section A: Mathematics , Volume 150 , Issue 1 , February 2020 , pp. 73 - 102
Copyright
Copyright © Royal Society of Edinburgh 2019

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