On the existence in Gevrey classes of local solutions to the Cauchy problem for nonlinear hyperbolic systems with Holder continuous coefficients

In this paper we shall solve locally in time the solutions to the Cauchy problem for first order quasilinear hyperbolic systems of which coefficients of principal part and of lower order terms are mu- Holder and mu'- Holder continuous in time variable respectively and in Gevrey class of index s with respect to space variables under the assumption 1 <= s < min {1 + mu/v, 1 + 1-mu+mu'/v}, 0 < mu <= 1, where v denotes the maximal muliplicity of characteristics of systems.