A symmetric theory of collisions

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Abstract
Instead of the usual transition operators Tβα, whose definitions change when the partitions corresponding to α and/or β change, it is possible to define a unique T-operator. The physical transition amplitudes are then recovered as residues of poles of specific matrix elements of the T-operator. Problems raised by the centre-of-mass motion, the Pauli principe and the post-prior alternative are simplified by the symmetry of the T-operator. The theory can be related to a variational principle in order to allow for practical calculations of the matrix elements of the T-operator
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