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Dec 11, 2021 at 16:08 answer added Alexander Strohmaier timeline score: 5
Sep 18, 2019 at 22:21 history edited Ali Taghavi CC BY-SA 4.0
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Sep 18, 2019 at 22:05 history edited Ali Taghavi CC BY-SA 4.0
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Sep 18, 2019 at 21:45 history made wiki Post Made Community Wiki by Todd Trimble
Sep 18, 2019 at 21:40 comment added Fabrice Baudoin There is a theory for subelliptic operators which are hypoelliptic but not elliptic operators: see for instance this paper :annals.math.princeton.edu/wp-content/uploads/…. There is also a theory for semi-elliptic (Lorentzian) operators: see for instance arxiv.org/pdf/1506.00959.pdf.
Sep 18, 2019 at 21:37 history edited Ali Taghavi
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Sep 18, 2019 at 21:18 history asked Ali Taghavi CC BY-SA 4.0