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Aug 19, 2017 at 11:48 vote accept Joseph O'Rourke
Oct 20, 2011 at 11:17 comment added Joseph O'Rourke Very nice!! Although this shows the generalization I suggested does not hold, it may be that you have uncovered a different theorem here. These degenerate tetrahedra are the maximum-area quadrilaterals inscribed in the "fattest" slice of the ellipsoid.
Oct 20, 2011 at 1:54 history answered Henry Cohn CC BY-SA 3.0