The material collected in this book originated from lectures given by authors over many years in Warsaw, Trieste, Schladming, Istanbul, Goteborg and Boulder. Th

Representation theory is an important part of modern mathematics, not only as a subject in its own right but also as a tool for many applications. It provides a

This book is intended to present group representation theory at a level accessible to mature undergraduate students and beginning graduate students. This is ach

Graphs drawn on two-dimensional surfaces have always attracted researchers by their beauty and by the variety of difficult questions to which they give rise. Th

This book reproduces the doctoral thesis written by a remarkable mathematician, Sergei V. Kerov. His untimely death at age 54 left the mathematical community wi