On discrepancy theorems with applications to approximation theory

Hans-Peter Blatt

Banach Center Publications (1995)

  • Volume: 31, Issue: 1, page 115-123
  • ISSN: 0137-6934

Abstract

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We give an overview on discrepancy theorems based on bounds of the logarithmic potential of signed measures. The results generalize well-known results of P. Erdős and P. Turán on the distribution of zeros of polynomials. Besides of new estimates for the zeros of orthogonal polynomials, we give further applications to approximation theory concerning the distribution of Fekete points, extreme points and zeros of polynomials of best uniform approximation.

How to cite

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Blatt, Hans-Peter. "On discrepancy theorems with applications to approximation theory." Banach Center Publications 31.1 (1995): 115-123. <http://eudml.org/doc/262757>.

@article{Blatt1995,
abstract = {We give an overview on discrepancy theorems based on bounds of the logarithmic potential of signed measures. The results generalize well-known results of P. Erdős and P. Turán on the distribution of zeros of polynomials. Besides of new estimates for the zeros of orthogonal polynomials, we give further applications to approximation theory concerning the distribution of Fekete points, extreme points and zeros of polynomials of best uniform approximation.},
author = {Blatt, Hans-Peter},
journal = {Banach Center Publications},
keywords = {zeros of polynomials; best uniform approximation},
language = {eng},
number = {1},
pages = {115-123},
title = {On discrepancy theorems with applications to approximation theory},
url = {http://eudml.org/doc/262757},
volume = {31},
year = {1995},
}

TY - JOUR
AU - Blatt, Hans-Peter
TI - On discrepancy theorems with applications to approximation theory
JO - Banach Center Publications
PY - 1995
VL - 31
IS - 1
SP - 115
EP - 123
AB - We give an overview on discrepancy theorems based on bounds of the logarithmic potential of signed measures. The results generalize well-known results of P. Erdős and P. Turán on the distribution of zeros of polynomials. Besides of new estimates for the zeros of orthogonal polynomials, we give further applications to approximation theory concerning the distribution of Fekete points, extreme points and zeros of polynomials of best uniform approximation.
LA - eng
KW - zeros of polynomials; best uniform approximation
UR - http://eudml.org/doc/262757
ER -

References

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  1. [1] H.-P. Blatt, E. B. Saff and V. Totik, The distribution of extreme points in best complex polynomial approximation, Constr. Approx. 5 (1989), 357-370. Zbl0705.41030
  2. [2] H.-P. Blatt and R. Grothmann, Erdős-Turán theorems on a system of Jordan curves and arcs, ibid. 7 (1991), 19-47. Zbl0764.30003
  3. [3] H.-P. Blatt, On the distribution of simple zeros of polynomials, Approx. Theory 69 (1992), 250-268. Zbl0757.41011
  4. [4] H.-P. Blatt, Verteilung der Nullstellen von Polynomen auf Jordanbögen, in: P. Ganzinger (ed.), Informatik, Festschrift zum 60. Geburstag von G. Hotz, Teubner, Stuttgart, 1992. 
  5. [5] H.-P. Blatt and H. N. Mhaskar, A general discrepancy theorem, Ark. Mat., to appear. Zbl0797.30032
  6. [6] P. Erdős and P. Turán, On the uniformly dense distribution of certain sequences of points, Ann. Math. 41 (1940), 162-173. Zbl66.0347.01
  7. [7] P. Erdős and P. Turán, On the uniformly dense distribution of certain sequences of points, ibid. 51 (1950), 105-119. 
  8. [8] T. Ganelius, Sequences of analytic functions and their zeros, Ark. Mat. 3 (1953), 1-50. 
  9. [9] R. Grothmann, Interpolation points and zeros of polynomials in approximation theory, Habilitationsschrift, Kath. Universität Eichstätt, 1993. 
  10. [10] M. I. Kadec, On the distribution of points of maximum deviation in the approximation of continuous functions by polynomials, Amer. Math. Soc. Transl. (2)26 (1963), 231-234. 
  11. [11] W. Kleiner, Sur l'approximation de la représentation conforme par la méthode des points extrémaux de M. Leja, Ann. Polon. Math. 14 (1964), 131-140. Zbl0128.07004
  12. [12] N. S. Landkof, Foundations of Modern Potential Theory, Springer, New York, 1972. 
  13. [13] H. N. Mhaskar, Some discrepancy theorems, in: Approximation Theory, Tampa, E. B. Saff (ed.), Lecture Notes in Math. 1287, Springer, New York, 117-131. 
  14. [14] M. Mignotte, Remarque sur une question relative à des fonctions conjuguées, C. R. Acad. Sci. Paris, to appear. Zbl0773.31002
  15. [15] Ch. Pommerenke, Über die Verteilung der Fekete-Punkte, Math. Ann. 168 (1967), 111-127. Zbl0145.31701
  16. [16] Ch. Pommerenke, Über die Verteilung der Fekete-Punkte II, ibid. 179 (1969), 212-218. 
  17. [17] P. Sjögren, Estimates of mass distributions from their potentials and energies, Ark. Mat. 10 (1972), 59-77. Zbl0232.31009
  18. [18] V. Totik, Distribution of simple zeros of polynomials, Acta Math. 170 (1993), 1-28. Zbl0888.41003
  19. [19] M. Tsuji, Potential Theory in Modern Function Theory, Chelsea, New York, 1950. Zbl0087.28401
  20. [20] J. L. Walsh, Interpolation and Approximation by Rational Functions in the Complex Domain, Amer. Math. Soc. Colloq. Publ. 20, 5th ed., Providence, 1969. 
  21. [21] H. Widom, Extremal polynomials associated with a system of curves in the complex plane, Adv. in Math. 3 (1969), 127-232. Zbl0183.07503

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