The universe is in motion. Least action is the principle underlying that motion. Let us look upon the revelations of this principle for the most elementary celestial motion, that of two heavenly bodies such as a planet and the sun. The trajectories of the bodies are the final flowering of the mathematical description. The action principle has provided their equations of motion; however the trajectories do not become apparent until the integrals of the equations of motion are found.
KeywordsAngular Momentum Poisson Bracket Rotational Symmetry Spinor Representation Classical Mechanics
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