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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1971 Aug;68(8):1686–1688. doi: 10.1073/pnas.68.8.1686

Systems of Conservation Equations with a Convex Extension

K O Friedrichs 1, P D Lax 1
PMCID: PMC389271  PMID: 16578711

Abstract

We discuss first-order systems of nonlinear conservation laws which have as a consequence an additional conservation law. We show that if the additional conserved quantity is a convex function of the original ones, the original system can be put into symmetric hyperbolic form. Next we derive an entropy inequality, which has also been suggested by I. Kružhkov, for discontinuous solutions of the given system of conservation laws.

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