Several monotonicity and concavity results related to the generalized digamma and polygamma functions are presented. This extends and generalizes the main results of Qi and Guo and others.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6154055PMC
http://dx.doi.org/10.1186/s13660-018-1844-2DOI Listing

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