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 Dec 11 awarded Nice Answer Nov 1 awarded Enlightened Nov 1 awarded Nice Answer Sep 14 awarded Popular Question Aug 27 awarded Yearling Apr 24 awarded Guru Oct 23 awarded Good Answer Sep 30 awarded Explainer Aug 27 awarded Yearling Aug 11 awarded Popular Question Jul 2 awarded Curious Jul 2 awarded Inquisitive Aug 27 awarded Yearling Feb 6 comment Proving ${(n+2)!}< \left(n(\sqrt{2}-1)+\sqrt{2}\right)^{n+2}$ For zero it is false :) Feb 4 revised Prove that f is differentiable in $\mathbb{R}$ edited title Feb 4 comment Find all the functions which satisfy a given functional equation @DejanGovc Thanks for pointing it out. Indeed I was wrong. now It should be fixed and luckily It was just me to be too lazy and always looking for a shortcut :D thanks again Feb 4 revised Find all the functions which satisfy a given functional equation added 62 characters in body Feb 4 comment Find all the functions which satisfy a given functional equation I substitute $f(x)-1\mapsto f(x)$. Does it convince you? Feb 4 revised Find all the functions which satisfy a given functional equation added 58 characters in body Feb 4 answered Find all the functions which satisfy a given functional equation