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For questions involving the Lagrangian formulation of a dynamical system. Namely, the application of an action principle to a suitably chosen Lagrangian or Lagrangian Density in order to obtain the equations of motion of the system.

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Is there an error in Susskinds' derivation of Euler-Lagrange equations?

Here are my thoughts (I may be wrong). The first equation states the action which is the integral of the Lagrangian with respect to time. Integrating is the equivalent of finding the areas of strips, …
Bradley Peacock's user avatar
7 votes
3 answers
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In equation (3) from lecture 7 in Leonard Susskind’s ‘Classical Mechanics’, should the deriv...

Here are the equations. ($V$ represents a potential function and $p$ represents momentum.) $$V(q_1,q_2) = V(aq_1 - bq_2)$$ $$\dot{p}_1 = -aV'(aq_1 - bq_2)$$ $$\dot{p}_2 = +bV'(aq_1 - bq_2)$$ Should th …
Bradley Peacock's user avatar