Abstract:
We construct multipoint Hermite–Padé approximations for two beta functions generating the Nikishin system with infinite discrete measures and unbounded supports. The asymptotic behavior of the approximants is studied. The result is interpreted in terms of the vector equilibrium problem in logarithmic potential theory in the presence of an external field and constraints on measure.
Keywords:
Hermite–Padé approximation, beta function, pole of a meromorphic function, logarithmic potential, Laurent series, Mittag–Leffler expansion, Cauchy transform, Riemann sphere, Rodrigues formula, Lebesgue measure.
Citation:
A. A. Kandayan, V. N. Sorokin, “Multipoint Hermite–Padé Approximations for Beta Functions”, Mat. Zametki, 87:2 (2010), 217–232; Math. Notes, 87:2 (2010), 204–217
This publication is cited in the following 7 articles:
V. N. Sorokin, “On Polynomials Defined by the Discrete Rodrigues Formula”, Math. Notes, 113:3 (2023), 420–433
V. N. Sorokin, “Multipoint Padé Approximation of the Psi Function”, Math. Notes, 110:4 (2021), 571–577
V. N. Sorokin, “Hermite-Padé approximants to the Weyl function and its derivative for discrete measures”, Sb. Math., 211:10 (2020), 1486–1502
V. N. Sorokin, “Multipoint Hermite–Padé approximants for three beta functions”, Trans. Moscow Math. Soc., 2018, 117–134
A. A. Kandayan, V. N. Sorokin, “Asymptotics of Multipoint Hermite–Padé Approximants of the First Type for Two Beta Functions”, Math. Notes, 101:6 (2017), 984–993
T. Rivoal, “Values of the Beta Function: from Ramanujan's Continued Fraction to Hermite–Padé Approximants”, Proc. Steklov Inst. Math., 298, suppl. 1 (2017), 57–69
V. N. Sorokin, “On multiple orthogonal polynomials for discrete Meixner measures”, Sb. Math., 201:10 (2010), 1539–1561