PageHeader : Funkcialaj Ekvacioj, 3 (1961), 115?146 Title : On the Characteristic Initial Value Problem for Title : Non-linear Wave Equations in Two Space Variables AuthorInfo : By Sadakazu AIZAWA AuthorInfo : (K?be University) section : Introduction section : 1. Generalized solutions section : 2. Comparison theorems section : 3. Existence theorems section : 4. Maximal and minimal solutions section : 5. Uniqueness conditions section : 6. Peano's property section : Bibliography