%0 Journal Article
%T The global existence theorem for quasi-linear wave equations with multiple speeds, II
%A Kunio Hidano
%J Mathematics
%D 2013
%I arXiv
%X The Cauchy problem is studied for systems of quasi-linear wave equations with multiple speeds in two space dimensions. Using the method of Klainerman and Sideris together with the localized energy estimate, we give an alternative proof of a beautiful result of Hoshiga and Kubo.
%U http://arxiv.org/abs/1310.6523v1