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Feb 26 at 23:10 comment added Willie Wong Note: there are easy counterexamples if you try to extend this to the third derivative.
Feb 26 at 12:45 vote accept Sébastien André-sloan
Feb 26 at 12:12 vote accept Sébastien André-sloan
Feb 26 at 12:45
Feb 26 at 5:59 history answered Willie Wong CC BY-SA 4.0