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Sigma KEE - VariableArityRelation
KB Term: 
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不定次元关系
这是个没有固定数量参数的 Relation Class
Relationships      
Parents 关系 The Class of relations. There are three kinds of Relation: Predicate, Function, and List. Predicates and Functions both denote sets of ordered n-tuples. The difference between these two Classes is that Predicates cover formula-forming operators, while Functions cover term-forming operators. A List, on the other hand, is a particular ordered n-tuple.


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