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Cet ouvrage est issu d'un cours de Master 2 enseigne a l'UPMC entre 2004 et 2007. Nous y presentons une selection de techniques mathematiques orientees vers la resolution des equations aux derivees partielles elliptiques semi-lineaires et quasi-lineaires. Apres un vade-mecum d'analyse reelle et d'analyse fonctionnelle de base pour les EDP, sans demonstrations pour les points les plus connus, nous parcourons ainsi les theoremes de point fixe classiques, les operateurs de superposition dans les espaces de Lebesgue et de Sobolev, la methode de Galerkin, les principes du maximum et la regularite elliptique, nous faisons une excursion assez longue dans divers aspects du calcul des variations puis terminons par les operateurs monotones et pseudo-monotones. Tout ceci est agremente d'exemples et chaque chapitre est complete d'un nombre d'exercices qui croit essentiellement avec le numero du chapitre, au fur et a mesure que de nouveaux materiaux sont presentes.
This book stems from lectures notes of a Master 2 class held at UPMC between 2004 and 2007. A selection of mathematical techniques geared towards the resolution of semilinear and quasilinear elliptic partial differential equations is presented. After a short survival guide in basic real and functional analysis for PDEs, without proofs for the most well-known results, we walk through the classical fixed point theorems, the superposition operators in Lebesgue and Sobolev spaces, the Galerkin method, the maximum principles and elliptic regularity, we make a rather long foray into various aspects of the calculus of variations, and conclude with monotone and pseudo-monotone operators, by way of numerous examples. Each chapter is complemented by a number of exercises that grows with the chapter number as more and more material is made available.
