... −1πH a, b,2.24for all a, b > 0witha/ b.2 Journal of Inequalities and ApplicationsLet C a, b a 2b2/ a b ,A a, b a b/2,G a, b√ab,andH a, b2ab/ a b be the contraharmonic, ... certain means of two arguments and their extensions,” InternationalJournal of Mathematics and Mathematical Sciences, no. 16, pp. 981–993, 2003.Journal of Inequalities and Applications 7Case ... Inequalitiesand Applications, vol. 2006, Article ID 46782, 25 pages, 2006.21 T. Hara, M. Uchiyama, and S E. Ta kahasi, “ A refinement of various mean inequalities,” Journal of Inequalities and...