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.
此外，讨论了P -自反性和自反性之间的关系。
Moreover, the relations between the P-reflexivity and the reflexivity are discussed.
满足传递性的自反关系称为预序关系。
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