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Feb 22, 2012 at 8:37 comment added Stefan Waldmann Hi Igor, maybe you're right and it is only about this inclusion. So the point would be to construct a particular wave equation which extremizes this support of its solutions. So I fear that my reference does not answer your question :( sorry
Feb 21, 2012 at 23:45 comment added Igor Khavkine Hi, Stefan. Thanks for the tip! I know that book and also think highly of it. I know for sure that they have a discussion of the domain of dependence theorem of the kind I described above ($D^G\subseteq D^A$). I'll take a look again to see if they talk about inclusion in the other direction or something related.
Feb 21, 2012 at 14:24 history answered Stefan Waldmann CC BY-SA 3.0