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Sigma KEE - SingleValuedRelation
KB Term: 
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单值关系
一个 RelationSingleValuedRelation 以确保除了最后一个参数之外,每一个参数的位置只有一个赋值,而最后的参数 顶多可以决定最后一个参数的位置。注:不是所有的 SingleValuedRelation 都是 TotalValuedRelation
Relationships      
Parents 可继承的关系 The class of Relations whose properties can be inherited downward in the class hierarchy via the subrelation Predicate.
  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.
Children 函数A Function is a term-forming Relation that maps from a n-tuple of arguments to a range and that associates this n-tuple with at most one range element. Note that the range is a SetOrClass, and each element of the range is an instance of the SetOrClass.


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