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We examine the formal foundations of quantum electrodynamics in the infinite-momentum frame. We interpret the infinite-momentum limit as the change of variables =2^-1{1} (t+z), Z=2^-1{1} (t-z), thus avoiding limiting procedures. Starting from the Feynman rules, we derive a -ordered perturbation expansion for the S matrix. We then show how this expansion arises from a canonical formulation of the field theory in the infinite-momentum frame. We feel that this approach should lead to convenient approximation schemes for electrodynamics at high energy.
Kogut et al. (Fri,) studied this question.