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切比雪夫多项式

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hbghlyj posted 2020-2-9 01:16 |Read mode
Last edited by hbghlyj 2020-2-9 01:55设$a_i\in\mathbf R(i=1,2,\cdots,n)$,且$f(x)=\sum\limits_{i=0}^na_ix^i$若有$|x|\le1$,则有$|f(x)|\le1$,以下结论是熟知的
(1)$|a_n|+|a_{n-1}|\le2^{n-1}$
(2)$|a_n|+|a_{n-1}|+\cdots+|a_1|+|a_0|\le\frac{(1+\sqrt2)^n+(1-\sqrt2)^n}2$
那么$|a_n|+|a_1|+|a_0|$有没有类似结论?

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青青子衿 posted 2020-2-12 10:23
一个多项式问题
chaoli.club/index.php/5018

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