Saddle Point Theorems
The classical instances of saddle point theorems are the minimax theorems of v. Neumann  (6.1.1) and Kakutani . Since then the saddle point concept has been found to apply in a much larger context. It is also a natural and rich source for duality theorems. In fact, every theorem stating the existence of a “saddle point” can be interpreted as duality theorem for a pair of dual programs.
KeywordsLagrange Multiplier Saddle Point Duality Theorem Constraint Qualification Minimax Theorem
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