Exactness of Lepage 2-forms and globally variational differential equations
Exactness of Lepage 2-forms and globally variational differential equations
The exactness equation for Lepage 2-forms, associated with variational systems of ordinary differential equations on smooth manifolds, is analyzed with the aim to construct a concrete global variational principle. It is shown that locally variational systems defined by homogeneous functions of degree $c \neq 0, 1$ are automatically globally variational. …