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 June 18th, 2014, 12:04 PM #1 Senior Member   Joined: Nov 2013 Posts: 137 Thanks: 1 Lagrangian and action A derivative of the action is the lagrangian: $\displaystyle \frac{\partial S}{\partial t} = L$ and the definite integral of the lagrangian is the action: $\displaystyle S = \int_{t_0}^{t_1} L dt$ Can you demonstrate me how from 1st equation I can come to 2nd and vice-versa?
 June 20th, 2014, 08:13 PM #2 Math Team   Joined: Nov 2010 From: Greece, Thessaloniki Posts: 1,989 Thanks: 133 Math Focus: pre pre pre pre pre pre pre pre pre pre pre pre calculus Can't you just integrate both sides?

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