Grace–Walsh–Szegő theorem

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

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

such that This mathematical analysis–related article is a stub.

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