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Approximating a norm by a polynomial

Alexander Barvinok
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Abstract

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.

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Alexander Barvinok. 2001-05-09. Approximating a norm by a polynomial. https://arxiv.org/abs/math/0105069

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