Andrew Magalich added Euler_Lagrange_equation_frac_dL__.tex  almost 8 years ago

Commit id: 56812751c24492b0f6e4f0882125e55ad2afc6f1

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Euler-Lagrange equation  $$  \frac{dL}{dx^\mu} = \frac{d}{d\tau} \frac{dL}{d\dot{x}^\mu}  $$