Английская Википедия:Grace–Walsh–Szegő theorem

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Шаблон:Short description In mathematics, the Grace–Walsh–Szegő coincidence theorem[1][2] is a result named after John Hilton Grace, Joseph L. Walsh, and Gábor Szegő.

Statement

Suppose ƒ(z1, ..., zn) is a polynomial with complex coefficients, and that it is

  • symmetric, i.e. invariant under permutations of the variables, and
  • multi-affine, i.e. affine in each variable separately.

Let A be a circular region in the complex plane. If either A is convex or the degree of ƒ is n, then for every <math>\zeta_1,\ldots,\zeta_n\in A</math> there exists <math>\zeta\in A</math> such that

<math> f(\zeta_1,\ldots,\zeta_n) = f(\zeta,\ldots,\zeta). </math>

Notes and references

Шаблон:Reflist

Шаблон:Mathanalysis-stub

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  1. ↑ "A converse to the Grace–Walsh–Szegő theorem", Mathematical Proceedings of the Cambridge Philosophical Society, August 2009, 147(02):447–453. Шаблон:Doi
  2. ↑ J. H. Grace, "The zeros of a polynomial", Proceedings of the Cambridge Philosophical Society 11 (1902), 352–357.
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