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when toggle format what by license comment
May 9, 2017 at 18:19 comment added Igor Rivin @SebastianGoette True enough!
May 9, 2017 at 15:24 comment added Sebastian Goette You might be more generous and allow simultaneous rotation and translation of plane curves, to produce helicoids as the easiest example.
May 8, 2017 at 21:50 history answered Igor Rivin CC BY-SA 3.0