Valeriy A. Yumaguzhin
Published 2008-04-04Version 1
In this paper, we investigate the action of pseudogroup of all point transformations on the natural bundle of equations $y''=a^3(x,y)(y')^3+a^2(x,y)(y')^2+a^1(x,y)y'+a^0(x,y)$. We construct differential invariants of this action and solve the equivalence problem for some classes of these equations in particular for generic equations.
On the obstruction to linearizability of 2-order ordinary differential equations
Equivalence of variational problems of higher order
Prolongations, invariants, and fundamental identities of geometric structures
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