Introduction

Abstract

These lecture notes aim to provide a phedagical review of non-Abelian discrete groups and show some applications to physical issues. We exhibit group-theoretical aspects of many concrete groups explicitly, for example, representations and their tensor products. For application to particle physics, we exaplain explicitly breaking patterns of discrete groups and anomalies of Abelian and non-Abelian symmetries. We also show some models, where non-Abelian discrete symmetries are applied to derive experimental values of quark and lepton masses and their mixing angles.