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Sigma KEE - Predicate
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谓语
Predicate 是一个作句的 Relation，这个 Relation 的每一个元组都是物体有限、有序的的句子。一个特定组员是一个 Predicate 的元素这事实，由 '(*predicate* arg_1 arg_2 .. arg_n)'来表示， arg_i 是关联的事物。在 BinaryPredicate 的情况下， 可以读成 `arg_1 是 *predicate* arg_2' 或者 `arg_1 的一个 *predicate* 是 arg_2'。
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 two kinds of Relation: Predicate and Function. 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.
Children 二元谓语A Predicate relating two items - its valence is two.
 ClosedWorldPredicate
 逻辑运算符This Class comprises all of the logical operators (viz. 'and', 'or', 'not', '=>', and '<=>').
 四元谓语The Class of Predicates that require four arguments.
 五元谓语The Class of Predicates that require five arguments.
 三元谓语The Class of Predicates that require exactly three arguments.


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