| Citation | Distinguished for his contributions to the Quantum Theory of Fields and the Physics of Elementary Particles. His important works concern (a) the discovery (also made independently by L.D. Landau) of singularities in the analytical structure of the Feynman integrals for processes in Quantum Field Theory, and (b) the discovery of the so-called Taylor-Slavnov identities in Gauge Theories. He has made significant contributions to Quantum Chromodynamics where his use of the axial guage has made possible recent advances in "perturbative Q.C.D.". He has also contributed to weak interaction theory, over a long period, and most recently to the elucidation of the guage structure of the unified weak and electromagnetic interaction. |