Convex functions play an important role in almost all branches of
mathematics, and this book is a thorough introduction to contemporary
convex function theory. It covers a large variety of subjects, from the
one real variable case (with all its mathematical gems) to some of the
most advanced topics such as Choquet's theory, the Prékopa-Leindler type
inequalities and their ramifications, as well as the variational
approach of partial differential equations and convex programming.