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when toggle format what by license comment
May 25, 2015 at 6:45 comment added Ural Bekbaev Your example shows that I can't expect too much from $f(x)$. It seems that I have to reformulate the question in the form:
May 24, 2015 at 1:52 vote accept Ural Bekbaev
May 22, 2015 at 19:24 history answered Felipe Voloch CC BY-SA 3.0