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when toggle format what by license comment
Feb 25, 2022 at 15:16 history edited coudy CC BY-SA 4.0
correct spelling
Jul 7, 2018 at 19:56 comment added Hans @NateEldredge: You are too kind. :-)
Jul 6, 2018 at 22:21 comment added Nate Eldredge Oh yeah, that's much better than mine. (Hint to people as slow as me: in the second line, $2f'f = (f^2)'$.)
Jul 6, 2018 at 21:58 history answered Hans CC BY-SA 4.0