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jackiefrost
- 140
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If you have the 4th ed. of Cornelius Lanczos' book on Variational Principles of Mechanics, could you explain to me how he got from eq. 53.4 to 53.5 (page 121). Eq. 53.4 defines the generalized momentum as the derivative of the Lagrangian, L, with respect to the velocities. Then, in eq. 53.5 he refers to the derivatives of the generalized momenta as equaling the derivative of L with respect to the positions. Is this right? This seems so simple yet for some reason (or lack thereof ) I'm not seeing the math from 53.4 to 53.5.
Thanks
Thanks