duality theorem

例句：

1. 1. The duality theorem states that the sum of two numbers is always greater than or equal to their product.
   双重定理表明两个数的和总是大于或等于它们的乘积。
2. 2.In mathematics, the duality theorem is used to study the properties of vector spaces and linear maps.
   在数学中，双重定理被用来研究向量空间的性质和线性映射。
3. 3. The duality theorem has important implications for the design of computer systems and algorithms.
   双重定理对计算机系统和算法的设计具有重要意义。