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Jun 17, 2014 at 12:37 comment added FraSchelle Thanks for this answer. I would like to understand in more details why having a pair of degenerate characteristics is a problem for such a system. I've asked something similar there : mathoverflow.net/q/171969/37254 , though a bit more complicated equation. If you would be kind enough to have a look, I'll be glad to have good references about this topic. Thanks in advance.
Mar 31, 2011 at 8:26 vote accept Yossi Farjoun
Mar 15, 2011 at 7:53 history answered Denis Serre CC BY-SA 2.5