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arXiv 2106.03378math.CA
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关于Whittaker和Kummer超几何函数非渐近零点位置的几点注记

Some Remarks on the Location of Non-Asymptotic Zeros of Whittaker and Kummer Hypergeometric Functions

Islam Boussaada, Guilherme Mazanti, Silviu-Iulian Niculescu

摘要:

本文研究了Whittaker和Kummer汇合型超几何函数的非渐近零点的位置。基于E.为了分析某些二阶常微分方程的解,我们刻画了Whittaker函数和Kummer函数零点实部的符号,并给出了这些零点在复平面上的位置估计.我们的主要结果是对G. E.茨维特科夫的传播导致了文献中的错误。特别地,我们回顾了E. B. Saff和R. S. Varga关于Pad{é}对指数函数的有理逼近的误差,这是建立在后者的基础上的.

英文摘要:

This paper focuses on the location of the non-asymptotic zeros of Whittaker and Kummer confluent hypergeometric functions. Based on a technique by E. Hille for the analysis of solutions of some second-order ordinary differential equations, we characterize the sign of the real part of zeros of Whittaker and Kummer functions and provide estimates on the regions of the complex plane where those zeros can be located. Our main result is a correction of a previous statement by G. E. Tsvetkov whose propagation has induced mistakes in the literature. In particular, we review some results of E. B. Saff and R. S. Varga on the error of Pad{é}'s rational approximation of the exponential function, which are based on the latter.

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。

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