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In $L_2$ space, only use domain [0, 1]. Prove, for any $C^2$ function F in $L_2$, there exits a sequence of polynomials ($f_k$) such that $f^{(r)}_k$ tends to $F^{(r)}$ for r=0,1,2 uniformly. Note: $f^{(r)}_k$ means the $r^{th}$ derivative of $f_k$.

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    thanks for your answer. It is right. I confused myself before.2012-10-17

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