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Complete Monotonicity of Functions Related to Trigamma and Tetragamma Functions

Mona Anis¹, Hanan Almuashi², Mansour Mahmoud^3,*

CMES-Computer Modeling in Engineering & Sciences, Vol.131, No.1, pp. 263-275, 2022, DOI:10.32604/cmes.2022.016927

Abstract In this paper, we study the completely monotonic property of two functions involving the function △(x) = and deduce the double inequality , x > 0
which improve some recent results, where ψ(x) is the logarithmic derivative of the Gamma function. Also, we deduce the completely monotonic degree of a function involving ψ'(x). More >

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