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部分给定系数多项式最大值的最小值。

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abababa posted 2020-3-22 11:52 |Read mode
如题,如果系数都不给定,切比雪夫多项式的一些定理可以求这类题目,但如果给定一些系数不能变,能不能再有什么类似的方法来求这类问题呢?
例如:$f(x)=\sum_{k=0}^{n}a_kx^k$,其中$a_i$是给定的,$i\in\mathbb{S}\subset{\mathbb{Z}^+}$,还能有通用方法来求$\left(\max_{x \in [\alpha,\beta]}\abs{f(x)}\right)_{\min}$吗?

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original poster abababa posted 2020-3-25 12:47
回复 1# abababa

如果做一些限制,假设$x^0,x^1$的系数不确定,其它系数都确定,能不能求解这类问题?感觉跟导数与直线有关。
如果继续做限制,假设$x^m$其中$m=0,1,\cdots,k$的系数不确定,其它系数都确定,能不能求解这类问题?

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hbghlyj posted 2022-11-9 06:46

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