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

Published online by Cambridge University Press:  23 January 2019

Alberto Boscaggin
Affiliation:
Dipartimento di Matematica, Università di Torino, via Carlo Alberto 10, 10123Torino, Italia ([email protected])
Francesca Colasuonno
Affiliation:
Dipartimento di Matematica, Alma Mater Studiorum Università di Bologna, piazza di Porta S. Donato 5, 40126Bologna, Italia ([email protected])
Benedetta Noris
Affiliation:
Laboratoire Amiénois de Mathématique Fondamentale et Appliquée, Université de Picardie Jules Verne, 33 rue Saint- Leu, 80039 AMIENS, France ([email protected])

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.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 2019

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