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[不等式] minmax求证q(x)是切比雪夫多项式

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hbghlyj Posted at 2023-8-5 13:57:24 |Read mode
Numerical Analysis by David E. Stewart 一道习题:
$q(x)$ 是次数$≤k$的多项式,使得 $\max_{x \in [-1, 1]} |x^{k+1}-q(x)|$ 最小,求证 $x^{k+1}-q(x)=2^{-k}T_{k+1}$.

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 Author| hbghlyj Posted at 2024-10-19 01:03:55
这个问题为什么这么久没有答复?

Minimal ∞-norm 中有一个证明

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 Author| hbghlyj Posted at 2024-10-19 01:56:12
hbghlyj 发表于 2024-10-18 17:03
这个问题为什么这么久没有答复?
我猜这是因为标题让问题看起来很复杂,所以大多人就不会点击标题!!所以下次试着让标题听起来简单一点(这样就能吸引人)

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