以粗糙逻辑为基础，首先给出了在新实例加入论域后判断约简变化与否以及判断原极小决策算法中决策规则变化与否的判定依据。
Based on rough logic, theorems is presented, whether attribute reduction and minimal decision algorithm change or not when a new instance is added to the universe.
本文根据极大极小代数理论，给出了一种用以求解动态规划中有限多阶段决策问题的代数算法。
On the basis of minimax algebra theory, this paper provides an algebra method of solving countable stages decision problems in the dynamic programming.
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