October  1997, 3(4): 477-502. doi: 10.3934/dcds.1997.3.477

Viscosity solutions and uniqueness for systems of inhomogeneous balance laws

1. 

Dip. di Matematica Pura e Appl., Via Campi 213/B, 41100 Modena, Italy

2. 

S.I.S.S.A., Via Beirut 2-4, 34013 Trieste, Italy

Received  November 1996 Published  July 1997

This paper is concerned with the Cauchy problem

$(*) \quad \quad u_t+[F(u)]_x=g(t,x,u),\quad u(0,x)=\overline{u}(x),$

for a nonlinear $2\times 2$ hyperbolic system of inhomogeneous balance laws in one space dimension. As usual, we assume that the system is strictly hyperbolic and that each characteristic field is either linearly degenerate or genuinely nonlinear.
Under suitable assumptions on $g$, we prove that there exists $T>0$ such that, for every $\overline{u}$ with sufficiently small total variation, the Cauchy problem ($*$) has a unique "viscosity solution", defined for $t\in [0,T]$, depending continuously on the initial data.

Citation: Graziano Crasta, Benedetto Piccoli. Viscosity solutions and uniqueness for systems of inhomogeneous balance laws. Discrete and Continuous Dynamical Systems, 1997, 3 (4) : 477-502. doi: 10.3934/dcds.1997.3.477
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