Abstract Feynman and De Witt showed, that the rules must be changed for the calculation of contributions from diagrams with closed loops in the theory of gauge invariant fields. They suggested also a… Expand

Introduction. 1. General Aspects of the Scattering Problem. 2. Stationary Approach to Scattering Theory. 3. The Method of Integral Equation. 4. Configuration Space. Neutral Particles. 5. Charged… Expand

The work gives a consistent and uniform exposition of all known results related to Heisenberg model. The classification of excitations is presented and their scattering is described both in… Expand

It is shown that a Schwinger term can appear in the commutation relations of constraints for the theory of the interacting Yang-Mills field and chiral fermions. Arguments are based on the… Expand