arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0708.0946math.CAmath.CV
收藏

分支点对分离的两个解析函数的Hermite-Pade有理逼近的渐近性(亏格为0的情况)

Asymptotics for Hermite-Pade rational approximants for two analytic functions with separated pairs of branch points (case of genus 0)

A. I. Aptekarev, A. B. J. Kuijlaars, W. Van Assche

摘要:

研究了两个函数的第二类Hermite-Pade逼近的渐近性态,其中每个函数有两个分支点,且分支点对是分离的。我们给出了一个分类的情况下,厄米-帕德逼近的极点的极限计数措施所描述的一个代数函数的3阶和亏格0。这种情况下,产生了一个矢量势平衡问题的三个措施和极点的公分母渐近分布像这些措施之一。我们还利用一个刻画该Hermite-Pade逼近问题的3 × 3黎曼-希尔伯特问题,得到了相应的Hermite-Pade逼近的强渐近性.

英文摘要:

We investigate the asymptotic behavior for type II Hermite-Pade approximation to two functions, where each function has two branch points and the pairs of branch points are separated. We give a classification of the cases such that the limiting counting measures for the poles of the Hermite-Pade approximants are described by an algebraic function of order 3 and genus 0. This situation gives rise to a vector-potential equilibrium problem for three measures and the poles of the common denominator are asymptotically distributed like one of these measures. We also work out the strong asymptotics for the corresponding Hermite-Pade approximants by using a 3x3 Riemann-Hilbert problem that characterizes this Hermite-Pade approximation problem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑