Abstract
The electro- and photo-production amplitudes on and off the pion mass shell are considered. The Khuri representation is profitably used to derive some superconvergence relations in the strong interaction case, in two different ways, and some current-algebra identities in the weak case. The Regge asymptotic behaviour of the invariant amplitudes is also examined. In the Appendix an old familiar result is obtained by new methods.
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