Geodesic
The~works of~the S.K.~Godunov seminar on~hyperbolic equations
Sibirskie èlektronnye matematičeskie izvestiâ, Tome 17 (2020), pp. А.59-А.67

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In the middle of 1970s at Novosibirsk State University the S. K. Godunov seminar on hyperbolic equations started its work. The article describes the works of the participants on hyperbolic equations. The main interest was concentrated around two problems. The first is the reduction of a high-order Petrovskiĭ hyperbolic equation to a first-order Friedrichs hyperbolic symmetric system. The second probem is that if a boundary value problem is posed for a hyperbolic equation then it is required to reduce it to a symmetric system so that the posed boundary condition be dissipative.
Keywords: wave equation, mixed problem, symmetric hyperbolic system, dissipative boundary condition. 
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     author = {V. M. Gordienko},
     title = {The~works of~the {S.K.~Godunov} seminar on~hyperbolic equations},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {{\CYRA}.59--{\CYRA}.67},
     publisher = {mathdoc},
     volume = {17},
     year = {2020},
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     url = {http://geodesic.mathdoc.fr/item/SEMR_2020_17_a145/}
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V. M. Gordienko. The~works of~the S.K.~Godunov seminar on~hyperbolic equations. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 17 (2020), pp. А.59-А.67. http://geodesic.mathdoc.fr/item/SEMR_2020_17_a145/