A reconsideration of Hua's inequality
Hiroyuki Takagi, Takeshi Miura, Tadashi Kanzo, Sin‐Ei Takahasi · Journal of Inequalities and Applications · 2005
The inequality discovered by L. K. Hua in 1965 has been generalized in several directions. In this paper, we adopt a certain conjugate method to give a simple and fundamental inequality on two functions on a semigroup, which is the key to the proof of many generalizations of Hua's inequality.