Abstract
The phase-space path-summation formulation of quantum theory is reviewed. The relationships to classical mechanics, and the greater generality (as compared with the original configuration-space path-summation formulation of Feynman) are stressed. Then the formulation is extended so that one can express the transition amplitude, between states (belonging to an arbitrary basis) of a finite-dimensional quantum system (with arbitrary Hamiltonina), in path-summation form.

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