Goodman, Bernard Department of Physics, University of Cincinnati, Cincinnati, Ohio.
- Least-action principles
- Action variables
- Significance in quantum mechanics
- Links to Primary Literature
- Additional Readings
Any one of a number of related integral quantities which serve as the basis for general formulations of the dynamics of both classical and quantum-mechanical systems. The term has been associated with four quantities: the fundamental action S, for general paths of a dynamical system; the classical action SC, for the actual path; the modified action S′, for paths restricted to a particular energy; and action variables, for periodic motions.
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