Pade Interpolation by F-Polynomials and Transfinite Diameter

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We define F-polynomials as linear combinations of dilations by some frequencies of an entire function F. In this paper we use Pade interpolation of holomorphic functions in the unit disk by F-polynomials to obtain explicitly approximating F-polynomials with sharp estimates on their coefficients. We show that when frequencies lie in a compact set K C C then optimal choices for the frequencies of interpolating polynomials are similar to Fekete points. Moreover, the minimal norms of the interpolating operators form a sequence whose rate of growth is determined by the transfinite diameter of K. In case of the Laplace transforms of measures on K, we show that the coefficients of interpolating polynomials stay bounded provided that the frequencies are Fekete points. Finally, we give a sufficient condition for measures on the unit circle which ensures that the sums of the absolute values of the coefficients of interpolating polynomials stay bounded.

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This manuscript from arXiv.org, for additional information see http://arxiv.org/abs/1105.0660


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