Lagrangian systems constitute a very important and old class in dynamics. Their origin dates back to the end of the eighteenth century, with Joseph-Louis Lagran

FACHGEB The last decade has seen a tremendous development in critical point theory in infinite dimensional spaces and its application to nonlinear boundary valu

This monograph collects cutting-edge results and techniques for solving nonlinear partial differential equations using critical points. Including many of the au

This text starts at the foundations of the field, and is accessible with some background in functional analysis. As such, the book is ideal for classroom of sel

"This volume consists of a selection of research-type articles on dynamical systems, evolution equations, analytic number theory and closely related topics. A s