Stehle, Philip Department of Physics, University of Pittsburgh, Pittsburgh, Pennsylvania.
Safko, John L. Formerly, Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina.
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Hamilton's principle obtains Lagrange's equations by variations about possible motions of the system between two times (that is, it is an integral principle) rather than changes in the instantaneous state (which is characteristic of a differential principle). See also: Lagrange's equations
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