Geodesic
Minimax theorems without changeless proportion
Discussiones Mathematicae. Differential Inclusions, Control and Optimization, Tome 23 (2003) no. 1, pp. 55-92.

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The so-called minimax theorem means that if X and Y are two sets, and f and g are two real-valued functions defined on X×Y, then under some conditions the following inequality holds:
Keywords: minimax theorems, t-convex functions, upward functions, jointly upward functions, X-quasiconcave sets 
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Chu, Liang-Ju; Tsai, Chi-Nan. Minimax theorems without changeless proportion. Discussiones Mathematicae. Differential Inclusions, Control and Optimization, Tome 23 (2003) no. 1, pp. 55-92. http://geodesic.mathdoc.fr/item/DMDICO_2003_23_1_a5/

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