2014 Reprint of 1931 Edition. Full facsimile of the original edition, not reproduced with Optical Recognition Software. This landmark among mathematics texts applies group theory to quantum mechanics, first covering unitary geometry, quantum theory, groups and their representations, then applications themselves - rotation, Lorentz, permutation groups, symmetric permutation groups, and the algebra of symmetric transformations. Hermann Weyl was one of the most influential mathematicians of the twentieth century. Along with his fundamental contributions to most branches of mathematics, Hermann...