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arXiv math/0105069math.FAmath.MG
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用多项式逼近范数

Approximating a norm by a polynomial

Alexander Barvinok

摘要:

我们证明了对于任何范数| *| 在d维实向量空间V中,对于任何奇数n>0,存在V中的2n次非负多项式p(x),x使得p^{1/2n}(x)< |x| < c(n,d)p^{1/2n}(x),其中c(n,d)={n+d-1 choose n}^{1/2n}。讨论了凸体的Minkowski泛函的推论和多项式逼近。

英文摘要:

We prove that for any norm |*| in the d-dimensional real vector space V and for any odd n>0 there is a non-negative polynomial p(x), x in V of degree 2n such that p^{1/2n}(x) < |x| < c(n,d) p^{1/2n}(x), where c(n,d)={n+d-1 choose n}^{1/2n}. Corollaries and polynomial approximations of the Minkowski functional of a convex body are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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