## Existence and uniqueness results for mixed problems for hyperbolic systems of one- dimensional conservation laws. (Resultats d’existence et d’unicite du probleme mixte pour des systemes hyperboliques de lois de conservation monodimensionnels.)(French)Zbl 0735.35092

The authors study nonlinear strictly hyperbolic systems of conservation laws in one space dimension: $(1)\;\partial_ t+\partial_ x(f\circ u)=0,\;(t,x)\in\mathbb{R}^ +\times\mathbb{R}^ +;\qquad (2) u(0,\cdot)=u_ 0;\qquad (3) u(\cdot,0)=a_ 0.$ Even in the linear case condition (3) must be relaxed to the ”condition of Kreiss” (*). In the nonlinear case the authors discuss two approaches: i) Connecting (1)-(3) with Riemann problems in $$\mathbb{R}^ +\times\mathbb{R}$$; ii) the method of entropy inequalities. Both lead to relaxations of (3) which reduce to (*) in the linear case. For the relaxed problems the authors establish a solution theory (uniqueness, approximation schemes and existence for small data).
Reviewer: N.Weck (Essen)

### MSC:

 35L65 Hyperbolic conservation laws 35A35 Theoretical approximation in context of PDEs
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### References:

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