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 Mar 31 awarded Nice Question Sep 24 awarded Autobiographer Sep 20 awarded Commentator Apr 20 comment A question from complex analysis @Peter Mueller,How do you find the Counter-example？ Apr 18 comment $f^3,f^2$ are the cube and quadratic of f respectively and both infinite differentiable on $R$,how to show so is $f$ @Terry Tao,I do not konw your article until now. Apr 18 comment $f^3,f^2$ are the cube and quadratic of f respectively and both infinite differentiable on $R$,how to show so is $f$ @Katz，I am a Chinese student,maybe I cannot understand your feeling exactly。I think you should not feel bad,they just give their views about this problem. Apr 17 comment $f^3,f^2$ are the cube and quadratic of f respectively and both infinite differentiable on $R$,how to show so is $f$ Thank you very much Apr 17 awarded Supporter Apr 17 accepted $f^3,f^2$ are the cube and quadratic of f respectively and both infinite differentiable on $R$,how to show so is $f$ Mar 29 comment $f^3,f^2$ are the cube and quadratic of f respectively and both infinite differentiable on $R$,how to show so is $f$ @Misha，f^2 means the square of f Mar 29 revised $f^3,f^2$ are the cube and quadratic of f respectively and both infinite differentiable on $R$,how to show so is $f$ edited title; edited title Mar 28 asked $f^3,f^2$ are the cube and quadratic of f respectively and both infinite differentiable on $R$,how to show so is $f$ Mar 16 comment functional equation, how to solve Maybe you can first think the case n=1 Mar 16 asked solvablity for some polynomial Dec 2 accepted a problem about field extension Nov 23 comment a problem about field extension O，I am a freshman in this website.Lots of thing need to learn. Nov 23 answered a problem about field extension Nov 23 asked a problem about field extension Aug 20 awarded Scholar Aug 20 awarded Student