Alexandru Kristaly is a professor of mathematics at the Department of Economics of the Babes-Bolyai University (Cluj-Napoca, Romania) and a research professor at the Obuda University (Budapest, Hungary). He is doing research in calculus of variations and geometric analysis, mainly focusing to elliptic PDEs, Riemann-Finsler geometry andequilibrium problems. He obtained twice the Janos Bolyai Research Fellowship of the Hungarian Academy of Sciences, and visited various research institutes as City University of Hong Kong, Institut des Hautes Études Scientifiques, Istituto Nazionale di Alta Matematica, Universitat Bern, etc. He is the leader of several research grants.

Csaba Gyorgy Varga is a professor of mathematics at the Department of Mathematics of the Babes-Bolyai University (Cluj-Napoca, Romania). His main research areas are topological and variational methods in the study of smooth and nonsmooth elliptic problems, including variational inequalities and differential inclusions. He has over 100 research papers with a broad variety of co-authors in various journals. He was a visiting professor at University of Perugia, University of Catania, Eotvos Lorand University, and others, being invited as a main speaker to various conferences. He supervised a number of PhD Students and has been the leader of research grants.

Covers the latest achievements in nonsmooth analysis, with applications in mechanics, engineering and game theory

Presents a set of arguments for investigating (smooth or nonsmooth) elliptic PDEs

Provides a detailed background in the appendices, making the book self-contained