Best uniform polynomial approximation of some rational functions |
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Authors: | Mehdi Dehghan MR Eslahchi |
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Affiliation: | 1. Department of Applied Mathematics, Faculty of Mathematics and Computer Sciences, Amirkabir University of Technology, No. 424, Hafez Ave., Tehran, Iran;2. Department of Applied Mathematics, Faculty of Mathematical Sciences, Tarbiat Modares University, P.O. Box 14115-134, Tehran, Iran |
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Abstract: | In this research paper using the Chebyshev expansion, we explicitly determine the best uniform polynomial approximation out of (the space of polynomials of degree at most ) to a class of rational functions of the form on , where is the first kind of Chebyshev polynomial of degree and . In this way we give some new theorems about the best approximation of this class of rational functions. Furthermore we obtain the alternating set of this class of functions. |
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