Key points are not available for this paper at this time.
A recurrence theorem is proved, which is the quantum analog of the recurrence theorem of Poincaré. Some statistical consequences of the theorem are stressed.Received 9 October 1956DOI:https://doi.org/10.1103/PhysRev.107.337©1957 American Physical Society
Bocchieri et al. (Mon,) studied this question.