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Sep 25, 2014 at 14:26 comment added Alexander Shamov Why on Earth would you expect this for general $f$, given that the derivative may not even exist?
Apr 28, 2014 at 7:00 answer added Bjørn Kjos-Hanssen timeline score: 1
Apr 11, 2014 at 1:15 history asked Amirreza Shaban CC BY-SA 3.0