Necessary and sufficient conditions for a difference constituted by four derivatives of a function involving trigamma function to be completely monotonic

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• Feng Qi

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• 33B15
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• 26A48
• 26A51
• 26D07
• 44A10

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• complete monotonicity
• necessary and sufficient condition
• difference
• derivative
• trigamma function
• convolution theorem for the Laplace transforms
• Bernstein's theorem for completely monotonic functions

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