Frobenius, Cartan, and the problem of Pfaff
The author studies deeply the problem of Pfaff and its origins in the theory of first-order partial differential equations, the contributions of Jacobi, Clebsch, Kronecker, Frobenius's integrability theorem, Darboux's theorem and Cartan's calculus of differential forms.
scientific article; zbMATH DE number 2174555