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arXiv 0903.3652math.CAmath.CV
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两个对称区间上$|x|^p$和$\sgn(x)$的最佳Laurent多项式逼近的渐近性

Asymptotics of the best polynomial approximation of $|x|^p$ and of the best Laurent polynomial approximation of $\sgn(x)$ on two symmetric intervals

F. Nazarov, F. Peherstorfer, A. Volberg, P. Yuditskii

摘要:

我们提出了一种新的方法,使我们能够得到一个直接的证明经典的Bernstein渐近的误差的最佳一致多项式逼近的$|x|^p$在两个对称的时间间隔。注意,另外,我们得到了多项式本身在某种重整化下的渐近性。同时,我们还解决了用Laurent多项式逼近$\sgn(x)$在$[-1,-a]\cup[a,1]$上的最佳逼近的渐近性问题.

英文摘要:

We present a new method that allows us to get a direct proof of the classical Bernstein asymptotics for the error of the best uniform polynomial approximation of $|x|^p$ on two symmetric intervals. Note, that in addition, we get asymptotics for the polynomials themselves under a certain renormalization. Also, we solve a problem on asymptotics of the best approximation of $\sgn(x)$ on $[-1,-a]\cup[a,1]$ by Laurent polynomials.

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