"Methods of Contemporary Gauge Theory" Yuri Makeenko. This book provides a thorough introduction to quantum theory of gauge fields. Emphasis is placed on four non-perturbative methods: path integrals, lattice gauge theories, the 1/N expansion, and reduced matrix models, which have important contemporary applications. #novetatsfiq
Sheldon Glashow on as a gauge group for unifying electromagnetism and weak interactions. The SU(n) groups find wide application in the Standard Model of particle physics, especially in the electroweak interaction.