PageHeader : Funkcialaj Ekvacioj, 6 (1964), 13?35 Title : The Characteristic Initial Value Problem Title : for a Non-linear Wave Equation AuthorInfo : By Sadakazu AIZAWA AuthorInfo : (K?be University) section : Introduction section : 1. Preliminaries section : 2. Definition of Generalized Solutions section : 3. Uniqueness of Weak Solutions section : 4. Existence of Weak Solutions section : 5. Continuous Dependence of Weak Solutions on the Function $t(x, $ t, $ $ 0) and on the Data $\varphi$ section : References