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J. Leray, J.L. Lions: Quelques resultats de Visik sur le problemes elliptiques non lineaires par les methodes de Minty-Browder.- J. Leray: Equations hyperboliques non-strictes: contre-exemples, du type de Giorgi aux theoremes d existence et d unicite.- J. Leray, Y. Ohya: Equations et systemes non-lineaires, hyperboliques non-stricts.- J. Leray, L. Waelbroeck: Norme formelle d une fonction composee (preliminaires a l etude des systemes non lineaires, hyperbolique non stricts).- J. Moser: Some aspects of non-linear equations.- I. Segal: La variete des solutions d une equation hyperbolique, non...

C. Baiocchi: Problemes a frontiere libre lies a des questions d'hydraulique.- Ch. Castaing: Integrales convexes duales.- G. Duvaut: Etude de problemes unilateraux en mecanique par des methodes variationnelles.- D. Kinderlehrer: Remarks about the free boundaries occurring in variational inequalities.- H. Lanchon: Torsion elastoplastique d'arbres cylindriques: problemes ouverts.- J.M. Lasry: Dualite en calcul des variations.- J.J. Moreau: On unilateral constraints, friction and plasticity.- B. Nayroles: Point de vue algebrique. Convexite et integrantes convexes en mecanique des solides.- W....

This unabridged republication of the 1980 text, an established classic in the field, is a resource for many important topics in elliptic equations and systems and is the first modern treatment of free boundary problems. Variational inequalities (equilibrium or evolution problems typically with convex constraints) are carefully explained in An Introduction to Variational Inequalities and Their Applications. They are shown to be extremely useful across a wide variety of subjects, ranging from linear programming to free boundary problems in partial differential equations. Exciting new areas like...