Abstract
A tentative review of recent results obtained by several authors will be presented. They mainly concern the derivation of analyticity properties for the Green's functions and collision amplitudes of the 2 → 2, 2 → 3, 3 → 3-particle processes from the general principles of Q.F.T. ; emphasis will be laid on the exploitation of asymptotic completeness which generates the monodromic structure of Green's functions. In this connection, the role played by “generalized Bethe-Salpeter kernels” will be described.
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