这一反自反性可以用来建立一个等价关系。
This irreflexivity can be used to set up an equivalence relation.
介绍了关系的定义、关系的自反性和反自反性、对称性和反对称性、传递性五条性质，及其在计算机领域中的应用。
The definition of relation, relations properties about to reflexive and irreflexive, symmetric and antisymmetric and transitive, and its application in computer science has been recited.
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