Geodesic
Interpolation operators on the space of holomorphic functions on the unit circle
Applications of Mathematics, Tome 46 (2001) no. 3, pp. 161-189.

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The aim of the paper is to get an estimation of the error of the general interpolation rule for functions which are real valued on the interval $[-a,a]$, $a\in (0,1)$, have a holomorphic extension on the unit circle and are quadratic integrable on the boundary of it. The obtained estimate does not depend on the derivatives of the function to be interpolated. The optimal interpolation formula with mutually different nodes is constructed and an error estimate as well as the rate of convergence are obtained. The general extremal problem with free weights and knots is solved.
DOI : 10.1023/A:1013787823049
Classification : 30E05, 41A05, 41A50, 41A80, 46N40, 65D05, 65D30
Keywords: numerical interpolation; optimal interpolatory rule with prescribed nodes; optimal interpolatory rule with free nodes; remainder estimation 
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Kofroň, Josef. Interpolation operators on the space of holomorphic functions on the unit circle. Applications of Mathematics, Tome 46 (2001) no. 3, pp. 161-189. doi : 10.1023/A:1013787823049. http://geodesic.mathdoc.fr/articles/10.1023/A:1013787823049/

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