Title : On the Characteristic Boundary Value Problem for Title : a Non-linear Hyperbolic Differential Equation AuthorInfo : Sadakazu AIZAWA AuthorInfo : (K?be University) section : Introduction section : 1. Preliminaries section : 2. Definition of Weak Solutions section : 3. Uniqueness of Weak Solutions section : 4. Existence of Weak Solutions section : 5. Continuous Dependence of Weak Solutions on the Function $f(x,t, $ 0) and on the Data $\varphi$ section : References