Cartan–Kähler theorem

Cartan–Kähler theorem

In mathematics, the Cartan–Kähler theorem is a major result on the integrability conditions for differential systems, in the case of analytic functions, for differential ideals "I". It is named for Élie Cartan and Erich Kähler.

It is not true that merely having "dI" contained in "I" is sufficient for integrability. There is a problem caused by singular solutions. The theorem computes certain constants that must satisfy an inequality in order that there be a solution.

The Cauchy-Kovalevskaya theorem is required, so the analyticity is necessary.

References

*Jean Dieudonné, "Eléments d'analyse", vol. 4, (1977) Chapt. XVIII.13

External links

*springer|first=D.V. |last=Alekseevskii|id=p/p072530|title=Pfaffian problem


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