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A reconsideration of Hua's inequality
Journal of Inequalities and Applications volume 2005, Article number: 150678 (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.
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Takagi, H., Miura, T., Kanzo, T. et al. A reconsideration of Hua's inequality. J Inequal Appl 2005, 150678 (2005). https://doi.org/10.1155/JIA.2005.15