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May 12, 2019 at 10:15 history edited Ice sea CC BY-SA 4.0
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May 12, 2019 at 10:14 comment added Ice sea @fedja However, how to get the estimate of the solution in the norm of Sobolev spaces. Does any book contains such materials.
May 12, 2019 at 10:11 comment added Ice sea @fedja I mean, of course, you can assume that the $\partial \Omega$ is non-characteristic.
May 12, 2019 at 9:32 comment added fedja What's wrong with the old good method of characteristics? It shows, by the way, that the system is unsolvable more often than not...
May 12, 2019 at 9:31 history edited Ice sea CC BY-SA 4.0
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May 12, 2019 at 9:25 history asked Ice sea CC BY-SA 4.0