duality theory的用法和样例：
例句
- There is also a comprehensive treatment of optimality conditions, Lagrange multiplier theory, and duality theory.
这门课程也包括了对最适化条件，拉格朗日乘数理论，和对偶理论的综合论述。 - This paper studies the saddle point and duality theory of set-valued optimization problems in the sense of strict efficiency.
摘要本文研究集值优化问题在严有效意义下的鞍点理论及对偶理论。
