A Cauchy-Kowalevsky theorem for overdetermined systems of nonlinear partial differential equations and geometric applications
arXiv:0811.1255
Abstract
We consider a Cauchy problem for an overdetermined system of PDEs, and give necessary and sufficient conditions for solvability of this Cauchy problem for all data. As an application, we find all real tube hypersurfaces in complex space whose Levi number is maximal.