On complete monotonicity of linear combination of finite psi functions

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Commun. Korean Math. Soc. 2019; 34(4): 1223-1228

Online first article August 27, 2019 Printed October 31, 2019

Bai-Ni Guo, Feng Qi

Henan Polytechnic University; Tianjin Polytechnic University

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In the paper, the authors supply complete monotonicity of linear combination of finite psi functions and extend some known results.

Keywords: complete monotonicity, psi function, linear combination, alternative proof

MSC numbers: Primary 26A48; Secondary 33B15, 44A10