fixpoint theory

例句：

1. 1.This theory suggests that the optimal solution is reached when all variables are at their fixed points.
   这个理论表明，当所有变量都达到其固定点时，最优解就得到了。
2. 2. The researcher proposed a new method to fixpoint theory, which has been widely applied in engineering design.
   研究者提出了一种新的方法来应用固定点理论，这种方法已经在工程设计中得到了广泛应用。
3. 3.In this paper, we will discuss how to apply the fixed-point theory to solve practical problems.
   在本文中，我们将讨论如何将固定点理论应用于解决实际问题。