Authors: F. Pugliese, A. M. Vinogradov
A general geometric method for studying mechanical
systems whose phase space may undergo an abrupt reduction is
proposed. This method is based on a variant of the Transition
Principle, proposed for the first time in Appendix II of paper by
Vinogradov, A.M., Kupershmidt, B.A., The Structures of
Hamiltonian Mechanics, Russ. Math.Surv. 2 (1977)
for elastic collisions.
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