This paper is concerned with the simple waves of a kind of two dimensional hyperbolic system of conservation laws,which can be obtained from the two dimensional relativistic membrane equation in Minkowski space.Using wave decomposition method,we get that a flow adjacent to a nonconstant state can be a global simple wave.Furthermore,the flow is covered by three families of characteristics,in which the first family of characteristics is straight and the others are curved,which is different to the almost related results.
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