JOURNAL OF MATHEMATICAL INEQUALITIES, cilt.17, sa.1, ss.99-111, 2023 (SCI-Expanded)
In this study, the generalized power mean inequalities with a negative parameter are refined using an optimality theorem on the generator function. The optimality theorem requires the study of different cases for the exponents and yields a refinement of the inequality in a neighbourhood of the vectors for which the equality occurs. Then, these local inequalities are generalized to all positive vectors by an appropriate selection of parameters.