The Theory of Groups and Quantum Mechanics is a book written by Hermann Weyl, a German mathematician and physicist. The book was first published in 1928 and has since become a classic in the field of quantum mechanics. The book explores the relationship between group theory and quantum mechanics. Group theory is a branch of mathematics that deals with the study of symmetry and transformation. In quantum mechanics, group theory is used to describe the symmetries of physical systems. Weyl's book provides an in-depth discussion of the mathematical concepts and principles behind group theory and quantum mechanics. He covers topics such as the representation theory of groups, the theory of Lie algebras, and the application of group theory to the study of atomic spectra. The book is aimed at advanced undergraduate and graduate students in mathematics and physics. It assumes a solid background in mathematical analysis and linear algebra. Overall, The Theory of Groups and Quantum Mechanics is a seminal work in the field of quantum mechanics and remains an important reference for researchers and students in the field.This is a new release of the original 1931 edition.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.