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Uniqueness for scalar conservation laws with discontinuous flux via adapted entropies. (English) Zbl 1071.35079
Summary: We prove uniqueness of solutions to scalar conservation laws with space discontinuous fluxes. To do so, we introduce a partial adaptation of Kružkov’s entropies which naturally takes into account the space dependency of the flux. The advantage of this approach is that the proof turns out to be a simple variant of the original method of Kružkov. In particular, we do not need traces, interface conditions, bounded variation assumptions (neither on the solution nor on the flux), or convex fluxes. However, we use a special ‘local uniform invertibility’ structure of the flux, which applies to cases where different interface conditions are known to yield different solutions.

35L65 Hyperbolic conservation laws
35L45 Initial value problems for first-order hyperbolic systems
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