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Bounded Approximation by Polynomials whose Zeros Lie on a Circle

Bounded Approximation by Polynomials whose Zeros Lie on a Circle

In a recent paper the first author gave an explicit construction of a sequence of polynomials having their zeros on the unit circumference which converge boundedly to a given bounded zero-free analytic function in the unit disk. In this paper we find the best possible uniform bound for such approximating …