Group Theory and Its Applications in Physics This textbook presents a careful introduction to group theory and its applications in atomic molecular and solid state physics. The reader is provided with the necessary background on the mathematical theory of groups and then shown how group theory is a powerful tool for solving physics problems. Worked examples and exercises with hints and answers encourage self study while the inclusion of some advanced subjects such as the theory of induced representations and ray representations Racah theory of atomic spectra and Landau theory of second order phase transitions should interest professionals