Mathematical Inequalities & Applications · Volume 18, Issue 1 Geometrically convergent sequences of upper and lower bounds on the Wallis ratio and related expressions 18-14 Pages 195-205 DOI 10.7153/mia-18-14 Downloads Short PDF Full PDF PNG Authors Iosif Pinelis Keywords gamma function digamma function Wallis ratio upper bounds lower bounds exact bounds inequalities in approximation Student's distribution Student's statistic probability inequalities Subject classes 33B15 26D07 26D15 41A17 33F05 65D20 60E15 62E15 62E17