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Apr 18, 2013 at 20:57 history edited user9072
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Apr 18, 2013 at 20:51 history edited user9072 CC BY-SA 3.0
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Jun 24, 2011 at 21:24 answer added Klaus Wälde - Mainz timeline score: 0
Mar 31, 2011 at 8:26 vote accept Yossi Farjoun
Mar 15, 2011 at 12:25 comment added Willie Wong @jc: 1st order scalar PDEs admit solutions via the method of characteristics. The same is not true for first order systems. (Any higher order PDE can be converted to a system of first order equations. I challenge you to solve $\triangle u = 0$ using the method of characteristics.)
Mar 15, 2011 at 7:53 answer added Denis Serre timeline score: 7
Mar 14, 2011 at 22:29 answer added Robert Israel timeline score: 4
Mar 14, 2011 at 11:34 history asked Yossi Farjoun CC BY-SA 2.5