Could someone please direct me to a good web page or comment on the main difference between the euler lagrange eqn and lagranges eqn of motion. I'm struggling to differentiate between the two.......(adsbygoogle = window.adsbygoogle || []).push({});

Also, I'm struggling to grasp the concept of Lagrange density - when does one introduce this into the action integral?

Cheers

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# Variational calculus

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