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Hamilton's principle states that the true evolution q(t) of a system described by N generalized coordinates q = (q 1, q 2, ..., q N) between two specified states q 1 = q(t 1) and q 2 = q(t 2) at two specified times t 1 and t 2 is a stationary point (a point where the variation is zero) of the action functional [] = ((), ˙ (),) where (, ˙,) is the Lagrangian function for the system.
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Action principles are "integral" approaches rather than the "differential" approach of Newtonian mechanics.[2]: 162 The core ideas are based on energy, paths, an energy function called the Lagrangian along paths, and selection of a path according to the "action", a continuous sum or integral of the Lagrangian along the path.
In physics, Hamilton's principle states that the evolution of a system ((), …, ()) described by generalized coordinates between two specified states at two specified parameters σ A and σ B is a stationary point (a point where the variation is zero) of the action functional, or = (,,, ˙,, ˙,) = where ˙ = / and is the Lagrangian.
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Action is significant because it is an input to the principle of stationary action, an approach to classical mechanics that is simpler for multiple objects. [1] Action and the variational principle are used in Feynman's formulation of quantum mechanics [2] and in general relativity. [3]
Scott Hamilton Jerod Harris/Getty Images for the Elton John AIDS Foundation Figure skating legend Scott Hamilton has had his share of health scares over the years, including three brain tumors and ...