Integrability Conditions For Differential Systems - Necessary and Sufficient Conditions

Necessary and Sufficient Conditions

The necessary and sufficient conditions for complete integrability of a Pfaffian system are given by the Frobenius theorem. One version states that if the ideal algebraically generated by the collection of αi inside the ring Ω(M) is differentially closed, in other words

then the system admits a foliation by maximal integral manifolds. (The converse is obvious from the definitions.)

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