On the asymptotic behavior of \(L_{p}\) extremal polynomials

Authors

  • Yamina Laskri University Badji Mokhtar Annaba, Algeria
  • Rachid Benzine University Badji Mokhtar Annaba, Algeria

DOI:

https://doi.org/10.33993/jnaat342-799

Keywords:

asymptotic behavior, \( L_{p}\) extremal polynomials
Abstract views: 324

Abstract

Let \(\beta \) denote a positive Szeg? measure on the unit circle \(\Gamma \) and \(\delta _{z_{k}}\) denote an anatomic measure (\(\delta \) Dirac) centered on the point \(z_{k}.\) We study, for all \(p>0,\) the asymptotic behavior of \(L_{p}\) extremal polynomials with respect to a measure of the type \[ \alpha =\beta +\sum_{k=1}^{\infty }A_{k}\delta _{z_{k}}, \] where \(\left\{ z_{k}\right\} _{k=1}^{\infty }\) is an infinite collection of points outside \(\Gamma \).

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References

Bello Hernandez, M., Marcellan, F. and Minguez Ceniceros, J., Pseudo uniform convexity in Hp and some extremal problems on Sobolev spaces, Complex variables, 48, no. 5, pp. 429-440, 2003, https://doi.org/10.1080/0278107031000097023 DOI: https://doi.org/10.1080/0278107031000097023

Benzine, R., Asymptotic behavior of orthogonal polynomials corresponding to a measure with infinite discrete part off a curve, J. Approx. Theory, 89, pp. 257-265, 1997, https://doi.org/10.1006/jath.1997.3041 DOI: https://doi.org/10.1006/jath.1997.3041

Bernstein, S.N., Sur les polynômes orthogonaux relatifs à un segment fini I, II, J. Math. Pures Appl., 9, pp. 127-177, 1930; 10, pp. 219-286, 1931.

Duren, P.L., Theory of H^{p} spaces, Academic Press. New York, 1970.

Geronimo, J.S. and Case, K.M., Scattering theory and polynomials orthogonal on the real line, Trans. Amer. Math. Soc., 258, pp. 467-494, 1980, https://doi.org/10.1090/s0002-9947-1980-0558185-4 DOI: https://doi.org/10.1090/S0002-9947-1980-0558185-4

Ya.L. Geronimus, On some extremal problems in the space Lσp, Mat. Sb. (N.S.), 31(73), pp. 3-26, 1952 (in Russian).

Gonchär, A.A., On convergence of Padé approximants for certain classes of meromorphic functions, Mat. Sb. J., 97, 1975, English translation: Math. USSR-Sb. 26. DOI: https://doi.org/10.1070/SM1975v026n04ABEH002494

Kaliaguine, V. and Benzine, R., Sur la formule asymptotique des polynômes orthogonaux associés à une mesure concentrée sur un contour plus une partie discrète finie, [An asymptotic formula for orthogonal polynomials associated with a measure concentrated on a contour plus a finite discrete part], Bull. Soc. Math. Belg. Ser. B, 41, no. 1, pp. 29-46, 1989 (in French).

Kaliaguine, V., On Asymptotics of Lp extremal polynomials on a complex curve (0

https://doi.org/10.1006/jath.1993.1063

DOI: https://doi.org/10.1006/jath.1993.1063

Khaldi, R. and Benzine, R., On a generalization of an asymptotic formula of orthogonal polynomials, Int. J. Appl. Math, 4, no. 3, pp. 261-274, 2000.

Khaldi, R. and Benzine, R., Asymptotics for orthogonal polynomials off the circle, J. Appl. Math., JAM 2004:1, pp. 37-53, 2004, https://doi.org/10.1155/s1110757x04304092 DOI: https://doi.org/10.1155/S1110757X04304092

Khaldi, R., Strong asymptotics for Lp extremal polynomials off a complex curve, Journal of Applied Mathematics, 5, pp. 371-378, 2004, https://doi.org/10.1155/s1110757x0430906x DOI: https://doi.org/10.1155/S1110757X0430906X

Koosis, P., Introduction to Hp Spaces, London Math. Soc. Lecture Notes Series, 40, Cambridge University Press, Cambridge, 1980.

Korovkine, P.P., On orthogonal polynomials on a closed curve, Math. Sbornik, 9, pp. 469-484, 1941 (in Russian).

Laskri, Y. and Benzine, R., Asymptotic behavior of L_{p} extremal polynomials corresponding to a measure with infinite discrete part off a curve, FAAT, Maratea, Italie, June 2004.

Li, X. and Pan, K., Asymptotics for Lp extremal polynomials on the unit circle, J. Approx. Theory, 67, pp. 270-283, 1991, https://doi.org/10.1016/0021-9045(91)90003-s DOI: https://doi.org/10.1016/0021-9045(91)90003-S

Li, X. and Pan, K., Asymptotic behavior of orthogonal polynomials corresponding to measure with discrete part off the unit circle, J. Approx. Theory, 79, pp. 54-71, 1994, https://doi.org/10.1006/jath.1994.1113 DOI: https://doi.org/10.1006/jath.1994.1113

Lubinsky, D.S. and Saff, E.B., Strong asymptotics for L^{p}-extremal polynomials (p>1) associated with weight on [-1,+1], Lecture Notes in Math. 1287, pp. 83-104, 1987, https://doi.org/10.1007/bfb0078899 DOI: https://doi.org/10.1007/BFb0078899

Lubinsky, D.S. and Saff, E.B., Szegö asymptotics for non Szegö weights on [-1,+1], ICM 89-007.

Lubinsky, D.S. and Saff, E.B., Strong asymptotics for extremal polynomials associated with weights on (-∞,+∞), Lecture Notes in Mathematics, 1305, Springer-Verlag, Berlin, 1988. DOI: https://doi.org/10.1007/BFb0082413

Lubinsky, D.S. and Saff, E.B., Sufficient Conditions for asymptotics associated with weighted extremal problems on R, Rocky Mountain J. Math., 19, pp. 261-269, 1989, https://doi.org/10.1216/rmj-1989-19-1-261 DOI: https://doi.org/10.1216/RMJ-1989-19-1-261

Nikishin, E.M., The discrete Sturm-liouville operator and some problems of function theory, Trudy Sem. Petrovsk. 10, pp. 3-77, 1984 (in Russian), English Transl. in Soviet Math., 35, pp. 2679-2744, 1987, https://doi.org/10.1007/bf01119188 DOI: https://doi.org/10.1007/BF01119188

Rudin, W., Real and Complex Analysis, McGraw-Hill, New York, 1968.

Smirnov, V.I. and Lebedev, N. A., The Constructive Theory of Functions of a Complex Variable, Nauka, Moscow, 1964 (in Russian); M.I.T. Press, Cambridge, MA, 1968 (Engl. transl.).

Smirnov, V.J., Sur la théorie des polynômes orthogonaux à une variable complexe, Journal de la Société Physico-Mathématique de Leningrad, 2,pp. 155-179, 1928.

Szegö, G., Orthogonal Polynomials, Amer. Math. Soc. Colloq. Publ., 23, 4th ed., American Math. Society, Providence, RI, 1975.

Szegö, G. and Grenander, U., Toeplitz forms and their applications, Berkley-Los Angeles, 1958, https://doi.org/10.1063/1.3062237 DOI: https://doi.org/10.1063/1.3062237

Widom, H., Extremal polynomials associated with a system of curves and arcs in the complex plane, Adv. Math., 3, pp. 127-232, 1969, https://doi.org/10.1016/0001-8708(69)90005-x DOI: https://doi.org/10.1016/0001-8708(69)90005-X

Yuditskii, P. and Peherstorfer, F., Asymptotics of orthonormal polynomials in the presence of a denumerable set of mass points, Proceedings of the American Mathematical Society, 129, 11, pp. 3213-3220, https://doi.org/10.1090/s0002-9939-01-06205-0 DOI: https://doi.org/10.1090/S0002-9939-01-06205-0

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Published

2005-08-01

How to Cite

Laskri, Y., & Benzine, R. (2005). On the asymptotic behavior of \(L_{p}\) extremal polynomials. Rev. Anal. Numér. Théor. Approx., 34(2), 125–134. https://doi.org/10.33993/jnaat342-799

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