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May 11, 2012 at 14:44 history edited Uday CC BY-SA 3.0
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May 10, 2012 at 20:00 answer added Bazin timeline score: 1
May 10, 2012 at 15:51 history edited Uday CC BY-SA 3.0
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May 10, 2012 at 7:23 comment added Deane Yang I believe that when symbols that are not real principal type or elliptic, then most if not all solvability and regularity results require assumptions on lower order terms. So there is at least a lot of circumstantial evidence for your hypothesis.
May 10, 2012 at 5:53 history edited Uday CC BY-SA 3.0
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May 9, 2012 at 20:03 history asked Uday CC BY-SA 3.0