Elie Cartan's geometrical vision or how to avoid expression swell

Details Elie Cartan's geometrical vision or how to avoid expression swell Elie Cartan's geometrical vision or how to avoid expression swell

2005-04-10

arxiv.org/abs/math/0504203v3

Mathematics

Differential Geometry

Scientific paper

The aim of the paper is to demonstrate the superiority of Cartan's method over direct methods based on differential elimination for handling otherwise intractable equivalence problems. In this sens, using our implementation of Cartan's method, we establish two new equivalence results. Weestablish when a system of second order ODE's is equivalent to flat system (second derivations are zero), and when a system of holomorphic PDE's with two independent variables and one dependent variables is flat. We consider the problem of finding transformation that brings a given equation to the target one. We shall see that this problem becomes algebraic when the symmetry pseudogroup of the target equation is zerodimensional. We avoid the swelling of the expressions, by using non-commutative derivations adapted to the problem.

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