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when toggle format what by license comment
Aug 3, 2019 at 19:21 history edited Joseph O'Rourke CC BY-SA 4.0
added 252 characters in body
Aug 3, 2019 at 18:17 comment added Manfred Weis I will delete the $\mathcal{E}_1$ part of the question; I had added that as the "ellipses in standard position" counterpart to the $\mathcal{E}_2$ set of ellipses that have their left focus in the origin and the right one on the x-axis.
Aug 3, 2019 at 17:56 history answered Joseph O'Rourke CC BY-SA 4.0