在此基础上引入不动点原理深入刻划循环不变式的含义，循环不变式可以表示为谓词泛函的最小不动点，并从范畴论的角度解释该过程。
Many loop invariants can be expressed in the form of the fixed point of a predicate universal function while weakest precondition is least fixed point and explained in the view of category theory.
讨论了半序集和半序拓扑空间中保序集值算子的最小与最大不动点的存在性。
The existence of the minimal and maximal fixed points for order preserving set-valued operators on semi-ordered sets and semi-ordered topological spaces was analyzed.
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