Geodesic
On the Structure of Solutions to a Model System That Is Nonstrictly Hyperbolic in the Sense of Petrovskii
Informatics and Automation, Differential equations and dynamical systems, Tome 308 (2020), pp. 232-242.

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We construct solutions to the Cauchy problem for a model system that is not hyperbolic in the sense of Friedrichs. To this end, we apply a new geometric method for constructing solutions to the Riemann problem. 
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V. V. Palin. On the Structure of Solutions to a Model System That Is Nonstrictly Hyperbolic in the Sense of Petrovskii. Informatics and Automation, Differential equations and dynamical systems, Tome 308 (2020), pp. 232-242. http://geodesic.mathdoc.fr/item/TRSPY_2020_308_a16/

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