Text: "About collision-process lifetime and causality." The authors generalize their previous results, by defining and calculating reaction and partial-process lifetimes, to the case of the two-wave-packet collisions with an arbitrary number of final packets. They express the principle of causality and the new one of "anticausality" in terms of interaction time shifts. Some notes about tachyons are added. (In English). Il Nuovo Cimento, Rivisita internazionale e organo della Societe italiana di fisica. Series 10, 63A(3), Oct. 1, 1969. p. 814-826.

See Also: tachyons, causality, anticausality, quantum mechanics.

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