On Complex (non analytic) Chebyshev Polynomials in $\bbC^2$

Details On Complex (non analytic) Chebyshev Polynomials in $\bbC^2$ On Complex (non analytic) Chebyshev Polynomials in $\bbC^2$

2010-02-10

arxiv.org/abs/1002.2060v1

Mathematics

Classical Analysis and ODEs

Scientific paper

We consider the problem of finding a best uniform approximation to the standard monomial on the unit ball in $\bbC^2$ by polynomials of lower degree with complex coefficients. We reduce the problem to a one-dimensional weighted minimization problem on an interval. In a sense, the corresponding extremal polynomials are uniform counterparts of the classical orthogonal Jacobi polynomials. They can be represented by means of special conformal mappings on the so-called comb-like domains. In these terms, the value of the minimal deviation and the representation for a polynomial of best approximation for the original problem are given. Furthermore, we derive asymptotics for the minimal deviation.

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