By using of the equivalence relations and set classification knowledge in the abstract algebra,explored the application of this knowledge in information of security management,simplifying mathematical matrix and teacher′s classroom management.%借助抽象代数中的等价关系与集合分类的知识，探讨了它们在信息安全管理、简化数学矩阵和班主任班级管理方面的应用。
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