Formal Integrability for the nonautonomous case of the inverse problem of the calculus of variations

Details Formal Integrability for the nonautonomous case of the inverse problem of the calculus of variations Formal Integrability for the nonautonomous case of the inverse problem of the calculus of variations

2012-03-08

arxiv.org/abs/1203.1716v2

Mathematics

Differential Geometry

Scientific paper

We address the integrability conditions of the inverse problem of the calculus of variations for time-dependent SODE using the Spencer version of the Cartan-K\"ahler Theorem. We consider a linear partial differential operator P given by the two Helmholtz conditions expressed in terms of semi-basic 1-forms and study its formal integrability. We prove that P is involutive and there is only one obstruction for the formal integrability of this operator. The obstruction is expressed in terms of the curvature tensor R of the induced nonlinear connection. We recover some of the classes of Lagrangian semisprays: flat semisprays, isotropic semisprays and arbitrary semisprays on 2-dimensional jet spaces.

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