Geodesic
Asymptotic behaviour of solutions of the first boundary-value problem for strongly hyperbolic systems near a conical point at the boundary of the domain
Sbornik. Mathematics, Tome 190 (1999) no. 7, pp. 1035-1058 Cet article a éte moissonné depuis la source Math-Net.Ru

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An existence and uniqueness theorem for generalized solutions of the first initial-boundary-value problem for strongly hyperbolic systems in bounded domains is established. The question of estimates in Sobolev spaces of the derivatives with respect to time of the generalized solution is discussed. It is shown that the smoothness of generalized solutions with respect to time is independent of the structure of the boundary of the domain but depends on the coefficients of the right-hand side. Results on the smoothness of the generalized solution and its asymptotic behaviour in a neighbourhood of a conical boundary point are also obtained. 
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Nguyen Manh Hung. Asymptotic behaviour of solutions of the first boundary-value problem for strongly hyperbolic systems near a conical point at the boundary of the domain. Sbornik. Mathematics, Tome 190 (1999) no. 7, pp. 1035-1058. http://geodesic.mathdoc.fr/item/SM_1999_190_7_a4/

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