2014 Reprint of 1955 Edition. Full facsimile of the original edition, not reproduced with Optical Recognition Software. Reprint of the 3rd Edition. Weyl was a German American mathematician who, through his widely varied contributions in mathematics, served as a link between pure mathematics and theoretical physics, in particular adding enormously to quantum mechanics and the theory of relativity. Hermann Weyl (1885-1955) was perhaps the most important and, above all, the most multifaceted of David Hilbert's students. His life's work encompassed such varied disciplines as number theory,...