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Some results on strongly nonlinear anisotropic differential equations

L. Bougoffa, A. El Khalil, S. El Manouni (2010)

Applicationes Mathematicae

The paper concerns the existence of weak solutions to nonlinear elliptic equations of the form A(u) + g(x,u,∇u) = f, where A is an operator from an appropriate anisotropic function space to its dual and the right hand side term is in L 1 + m with 0 < m < 1. We assume a sign condition on the nonlinear term g, but no growth restrictions on u.

Spectre d'ordre supérieur et problèmes aux limites quasi-linéaires

Aomar Anane, Omar Chakrone, Jean-Pierre Gossez (2001)

Bollettino dell'Unione Matematica Italiana

Nello studio dei problemi del tipo - Δ u = f x , u + h x , si impongono generalmente delle condizione sul comportamento asintotico di f x , u rispetto allo spettro di - Δ . Avendo in vista dei problemi quasilineari del tipo - Δ u = f x , u , u + h x , sembra naturale introdurre una nozione di spettro per - Δ che tenga conto della dipendenza del membro di destra rispetto al gradiende u . L'oggetto di questo lavoro è di definire, studiare e applicare questa nuova nozione di spettro.

Spherical semiclassical states of a critical frequency for Schrödinger equations with decaying potentials

Jaeyoung Byeon, Zhi-Qiang Wang (2006)

Journal of the European Mathematical Society

For singularly perturbed Schrödinger equations with decaying potentials at infinity we construct semiclassical states of a critical frequency concentrating on spheres near zeroes of the potentials. The results generalize some recent work of Ambrosetti–Malchiodi–Ni [3] which gives solutions concentrating on spheres where the potential is positive. The solutions we obtain exhibit different behaviors from the ones given in [3].

Stability of solutions for an abstract Dirichlet problem

Marek Galewski (2004)

Annales Polonici Mathematici

We consider continuous dependence of solutions on the right hand side for a semilinear operator equation Lx = ∇G(x), where L: D(L) ⊂ Y → Y (Y a Hilbert space) is self-adjoint and positive definite and G:Y → Y is a convex functional with superquadratic growth. As applications we derive some stability results and dependence on a functional parameter for a fourth order Dirichlet problem. Applications to P.D.E. are also given.

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