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On complete monotonicity of certain special functions


Author: Ruiming Zhang
Journal: Proc. Amer. Math. Soc. 146 (2018), 2049-2062
MSC (2010): Primary 33D15; Secondary 33C45, 33C10, 33E20
DOI: https://doi.org/10.1090/proc/13878
Published electronically: December 11, 2017
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Abstract: Given an entire function $ f(z)$ that has only negative zeros, we shall prove that all the functions of type $ f^{(m)}(x)/f^{(n)}(x),\ m>n$ are completely monotonic. Examples of this type are given for Laguerre polynomials, ultraspherical polynomials, Jacobi polynomials, Stieltjes-Wigert polynomials, $ q$-Laguerre polynomials, Askey-Wilson polynomials, Ramanujan function, $ q$-exponential functions, $ q$-Bessel functions, Euler's gamma function, Airy function, modified Bessel functions of the first and the second kind, and the confluent basic hypergeometric series.


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Additional Information

Ruiming Zhang
Affiliation: College of Science Northwest A&F University Yangling, Shaanxi 712100 People’s Republic of China.
Email: ruimingzhang@yahoo.com

DOI: https://doi.org/10.1090/proc/13878
Keywords: Complete monotonicity; orthogonal polynomials; Askey-Wilson polynomials; confluent basic hypergeometric series; $q$-Bessel functions; Airy function.
Received by editor(s): June 27, 2017
Received by editor(s) in revised form: July 2, 2017
Published electronically: December 11, 2017
Additional Notes: This research was supported by National Natural Science Foundation of China, grant No. 11371294.
Communicated by: Mourad Ismail
Article copyright: © Copyright 2017 American Mathematical Society

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