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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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I'm trying to reach Lagrange's equations by D'alembert's principle. $$\sum_{i=1}^N (m_i\ddot{\mathbf{x}}_i - \mathbf{F}_i)·\frac{\partial\ddot{\mathbf{x}}_i}{\partial q^\alpha}=0$$ or $$\sum_{i=1}^N …
asked Dec 15 '17 by Kenaisp