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math.DG2016
On the local equivalence of partial differential equations
A. Kumpera
In all the practical applications of partial differential equations, what is mostly needed and what is in fact hardest to obtains are the solutions of the system or, occasionally,…
math.DG2016
Group invariance of integrable Pfaffian systems
A. Kumpera
Let be an integrable Pfaffian system. If it is invariant under a transversally free infinitesimal action of a finite dimensional real Lie algebra and consequently…
math.DG2016
Non-Integrable Pfaffian Systems
A. Kumpera
We discuss a recurrent geometrical method, due to Élie Cartan and von Weber ([1],[11]) enabling us to determine, step by step, the maximal integral manifolds of a not necessarily i…