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Revista mexicana de física E
Print version ISSN 1870-3542
Abstract
TORRES DEL CASTILLO, G.F.; ANDRADE MIRON, C. and BRAVO ROJAS, R.I.. Variational symmetries of Lagrangians. Rev. mex. fís. E [online]. 2013, vol.59, n.2, pp.140-147. ISSN 1870-3542.
We present an elementary derivation of the equation for the infinitesimal generators of variational symmetries of a Lagrangian for a system with a finite number of degrees of freedom. We also give a simple proof of the existence of an infinite number of Lagrangians for a given second-order ordinary differential equation.
Keywords : Lagrangians; symmetries; constants of motion; ordinary differential equations.