Sur la condition de Levi pour des systèmes hyperboliques à caractéristiques de multiplicité variable. (French) Zbl 0432.35054
MSC:
35L55 | Higher-order hyperbolic systems |
35A30 | Geometric theory, characteristics, transformations in context of PDEs |
35L55 | Higher-order hyperbolic systems |
35A30 | Geometric theory, characteristics, transformations in context of PDEs |