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Sigma KEE - EquivalenceRelation
KB Term: 
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等价关系
一个 BinaryRelation 是等价关系如果它是 一个 ReflexiveRelationSymmetricRelationTransitiveRelation
Relationships      
Parents 自反关系 Relation ?REL is reflexive iff (?REL ?INST ?INST) for all ?INST.
  对称关系 A BinaryRelation ?REL is symmetric just iff (?REL ?INST1 ?INST2) imples (?REL ?INST2 ?INST1), for all ?INST1 and ?INST2.
  传递关系 A BinaryRelation ?REL is transitive if (?REL ?INST1 ?INST2) and (?REL ?INST2 ?INST3) imply (?REL ?INST1 ?INST3), for all ?INST1, ?INST2, and ?INST3.


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