Sur un théorème de Cauchy–Kowalewski–Nagumo global

Abstract

In this Note, we solve some global linear Cauchy problems. In the holomorphic case, for some operators, our result extends those of [4] when the initial data is in Gevrey class. In the continuous case, we give a generalisation of the local result of N. Nagumo, and on other hand, our result is an extension of the results of [5,1] for Gevrey initial data without the hyperbolicity condition. To cite this article: D. Gourdin, M. Mechab, C. R. Acad. Sci. Paris, Ser. I 334 (2002) 563–567.