Homogeneity and projective equivalence of differential equation fields

Details Homogeneity and projective equivalence of differential equation fields Homogeneity and projective equivalence of differential equation fields

2011-09-16

arxiv.org/abs/1109.3640v1

Mathematics

Differential Geometry

Scientific paper

We propose definitions of homogeneity and projective equivalence for systems of ordinary differential equations of order greater than two, which allow us to generalize the concept of a spray (for systems of order two). We show that the Euler-Lagrange fields of parametric Lagrangians of order greater than one which are regular (in a natural sense that we define) form a projective equivalence class of homogeneous systems. We show further that the geodesics, or base integral curves, of projectively equivalent homogeneous differential equation fields are the same apart from orientation-preserving reparametrization; that is, homogeneous differential equation fields determine systems of paths.

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