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Aug 23, 2016 at 14:48 vote accept Julien Bernard
Dec 5, 2015 at 11:40 history edited Robert Bryant CC BY-SA 3.0
Added a comment on the Finsler surface case characterizing when the fourth power is smooth
Nov 29, 2015 at 22:13 history edited Robert Bryant CC BY-SA 3.0
Added some more detail about the method of solution
Nov 27, 2015 at 23:42 history answered Robert Bryant CC BY-SA 3.0