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w 1. Introduction The success of variational methods in the solution of scattering problems [9] has aroused an interest in the rigorous formulation and deeper understanding of these methods [1], [4], [6]. In this paper, we examine the variational principle for the one-dimensional quantum scattering of a plane wave with OO positive energy, k S, by a positive potential, V(x), for which f V(x) dx < oo We find: - oo OO

The schwinger variational principles for one-dimensional quantum scattering