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Angular Distribution of Zeros of the Partial Sums of ez via the Solution of Inverse Logarithmic Potential Problem

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Abstract

We continue the work of Szegő [18] on describing the angular distribution of the zeros of the normalized partial sum s n(nz) of e z, where \(s _{n}(z):={\sum _{k=0} ^{n}}z ^k/k!\). We imbed this problem in some inverse problem of potential theory and prove a so-called Erdős-Turán-type theorem, which is of interest in itself.

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References

  1. V. V. Andrievskii, V. I. Belyi and V. K. Dzjadyk, Conformal Invariants in Constructive Theory of Functions of Complex Variable, Atlanta, Georgia, World Federation Publisher, 1995.

    MATH  Google Scholar 

  2. V. V. Andrievskii and H. -P. Blatt, Discrepancy of Signed Measures and Polynomial Approximation, Berlin/New York, Springer-Verlag, 2002.

    MATH  Google Scholar 

  3. H.-P. Blatt, On the distribution of simple zeros of polynomials, J. Approx. Theory 69 (1992), 250–268.

    Article  MathSciNet  MATH  Google Scholar 

  4. H.-P. Blatt and R. Grothmann, Erdős-Turán theorems on a system of Jordan curves and arcs, Constr. Approx. 7 (1991), 19–47.

    Article  MathSciNet  MATH  Google Scholar 

  5. H.-P. Blatt and H. N. Mhaskar, A general discrepancy theorem, Ark. Mat. 31 (1993), 219–246.

    Article  MathSciNet  MATH  Google Scholar 

  6. 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.

    Article  MathSciNet  MATH  Google Scholar 

  7. J. D. Buckholtz, A characterization of the exponential series, Amer. Math. Monthly 73 Part II (1966), 121–123.

    Article  MathSciNet  MATH  Google Scholar 

  8. A. J. Carpenter, R. S. Varga and J. Waldvogel, Asymptotics for the zeros of partial sums of e z, I, Rocky Mountain J. 21 (1991), 99–120.

    Article  MathSciNet  MATH  Google Scholar 

  9. P. Erdős and P. Turán, On the uniformly-dense distribution of certain sequences of points, Annals of Math. 41 (1940), 162–173.

    Article  Google Scholar 

  10. P. Erdős and P. Turán, On a problem in the theory of uniform distribution, I and II, Indag. Math. 10 (1948), 370–378, 406–413.

    Google Scholar 

  11. P. Erdős and P. Turán, On the distribution of roots of polynomials, Annals of Math. 51 (1950), 105–119.

    Article  Google Scholar 

  12. G. M. Goluzin, Geometric Theory of Functions of a Complex Variable, (in Russian), Moscow, Nauka, 1966.

    MATH  Google Scholar 

  13. O. Lehto and K. I. Virtanen, Quasiconformal Mappings in the Plane, 2nd ed., Berlin, Springer-Verlag, 1973.

    Book  MATH  Google Scholar 

  14. H. N. Mhaskar, Some discrepancy theorems, in: E. B. Saff (ed.), Approximation Theory, Tampa, Springer Lecture Notes 1287 Berlin, Springer Verlag, (1987), 117–131.

  15. Ch. Pommerenke, Boundary Behaviour of Conformal Maps, New York/Berlin, Springer Verlag, 1992.

    Book  MATH  Google Scholar 

  16. I. E. Pritsker and R. S. Varga, The Szegő curve, zero distribution and weighted approximation, Trans. Amer. Math. Soc. 349 (1997), 4085–4105.

    Article  MathSciNet  MATH  Google Scholar 

  17. E. B. Saff and V. Totik, Logarithmic Potentials with External Fields, New York/Berlin, Springer Verlag, 1997.

    MATH  Google Scholar 

  18. G. Szegő, Über eine Eigenschaft der Exponentialreihe, Sitzungsber. Berl. Math. Ges. 23 (1924), 50–64.

    Google Scholar 

  19. V. Totik, Distribution of simple zeros of polynomials, Acta Math. 170 (1993), 1–28.

    Article  MathSciNet  MATH  Google Scholar 

  20. M. Tsuji, Potential Theory in Modern Function Theory, New York, Chelsea, 1950.

    Google Scholar 

  21. R. S. Varga, A. J. Carpenter and B. W. Lewis, The dynamical movements of the zeros of the normalized zeros of the partial sums of exp(z), to appear in Electronic Transactions on Numerical Analysis (ETNA).

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Correspondence to Vladimir V. Andrievskii.

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Andrievskii, V.V., Carpenter, A.J. & Varga, R.S. Angular Distribution of Zeros of the Partial Sums of ez via the Solution of Inverse Logarithmic Potential Problem. Comput. Methods Funct. Theory 6, 447–458 (2006). https://doi.org/10.1007/BF03321622

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