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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
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
更新日期:2021-01-16
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 , , is an entire function such that the sequence is non-decreasing and , 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 , ,是一个完整的函数,使得序列 不减少 ,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)。