It is shown that if one omits a certain small term which appears in one of the integral equations describing rearrangement collisions, then that equation becomes inconsistent with the others. This result is of interest because the presence or absence of this term represents the essential formal difference between several recent theories of rearrangement collisions.

• Received 1 June 1956

DOI:https://doi.org/10.1103/PhysRev.106.598