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On the entire functions from the Laguerre–Pólya I class having the increasing second quotients of Taylor coefficients
Journal of Mathematical Analysis and Applications ( IF 1.3 ) Pub Date : 2021-01-13 , DOI: 10.1016/j.jmaa.2021.124955
Thu Hien Nguyen , Anna Vishnyakova

We prove that if f(x)=k=0akxk, ak>0, is an entire function such that the sequence Q:=(ak2ak1ak+1)k=1 is non-decreasing and a12a0a2223, then all but a finite number of zeros of f are real and simple. We also present a criterion in terms of the closest to zero roots for such a function to have only real zeros (in other words, for belonging to the Laguerre–Pólya class of type I) under additional assumption on the sequence Q.



中文翻译:

关于Laguerre-PólyaI类的所有函数,具有泰勒系数的第二商增加

我们证明 FX=ķ=0一种ķXķ一种ķ>0,是一个完整的函数,使得序列 =一种ķ2一种ķ-1个一种ķ+1个ķ=1个 不减少 一种1个2一种0一种2223,则除有限数量的f之外的所有零都是实且简单的。在序列Q的附加假设下,我们还提出了一个最接近零根的准则,该函数仅具有实零(换言之,属于I型的Laguerre-Pólya类)。

更新日期:2021-01-16
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