Abstract
In this paper we deal with theorems of the alternative for systems of inequalities. Precisely, we give a formulation that encompasses several known alternative theorems and unifies their treatment under a minimax equality assumption which is fulfilled by a whole panoply of families of functions. We also give extensions of Yuan’s lemma to systems with several general functions provided that they fulfill a certain minimax theorem, and to some particular systems of several quadratic functions.
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Roubi, A. Theorems of the Alternative Revisited and Some Extensions of Yuan’s Lemma. Set-Valued Var. Anal 30, 1213–1232 (2022). https://doi.org/10.1007/s11228-022-00641-4
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DOI: https://doi.org/10.1007/s11228-022-00641-4