PageHeader : Funkcialaj Ekvacioj, 39 (1996) 235-307 Title : The Cauchy Problem for a Class of Hyperbolic Operators Title : with Double Characteristics AuthorInfo : By AuthorInfo : Kunihiko KAJITANI and Seiichiro WAKABAYASHI AuthorInfo : (University of Tsukuba, Japan) section : 1. Introduction section : 2. Preliminaries section : 3. Proof of Theorem 1.3 section : 4. Some remarks and examples section : Appendix section : References