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On some inequalities for the gamma and psi functions. (English) Zbl 0854.33001
Summary: We present new inequalities for the gamma and psi functions, and we provide new classes of completely monotonic, star-shaped, and super-additive functions which are related to $$\Gamma$$ and $$\psi$$.

##### MSC:
 33B15 Gamma, beta and polygamma functions 26D07 Inequalities involving other types of functions
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