[Tehseen 2014]
For finite $k$, Cartan distribution $\mathcal{C}$ is generated by
$$ D_{x^i}^{(k)} :=\partial x_{i}+\sum_{\alpha=1}^{q} \sum_{0 \leq|J|In general, is not Frobenius integrable, but Vessiot gave a method to construct all the integrable subdistributions for a given distribution.
The integral manifolds of this distribution are the solutions of system of DEs (provided they have the proper dimension, I guess...)
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Author of the notes: Antonio J. Pan-Collantes
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