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The global existence theorem for quasi-linear wave equations with multiple speeds, II (1310.6523v1)
Published 24 Oct 2013 in math.AP
Abstract: 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.