Abstract
IN the theory of interaction of particles like photons and electrons or mesons and nucleons, etc., the experiments are always made in such a way that the different kinds of particles are observed in different parts of space with different instruments. In these parts of space one can speak of pure kinds of particles and describe them by pure quantized fields—Maxwell's field, Dirac's field, etc. However, in the part of space where the collisions really take place, the pure fields are not simply additive but have to be supplemented by an interaction field. All effects due to the interaction can be obtained by considering the stationary states of the whole system.
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