The Schwinger variational principle for the rearrangement collisions

The Lippmann-Schwinger equations were rewritten in the form of Faddeev equations. The number of equations is determined by the number of open channels. On the basis of the Schwinger variational principle the approximate one-dimensional equations for the rearrangement collisions are obtained.Submitted to the symposium Mesons and Light Nuclei, Liblice, Czechoslovakia, June 1981.In conclusion the authors wish to thank V. B. Belyaev for useful discussions and interest in this work.