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Sigma KEE - Predicate
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predicate
A Predicate is a sentence-forming Relation. Each tuple in the Relation is a finite, ordered sequence of objects. The fact that a particular tuple is an element of a Predicate is denoted by '(*predicate* arg_1 arg_2 .. arg_n)', where the arg_i are the objects so related. In the case of BinaryPredicates, the fact can be read as `arg_1 is *predicate* arg_2' or `a *predicate* of arg_1 is arg_2'.
Relationships      
Parents inheritable relation The class of Relations whose properties can be inherited downward in the class hierarchy via the subrelation Predicate.
  relation 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 binary predicateA Predicate relating two items - its valence is two.
 logical operatorThis Class comprises all of the logical operators (viz. 'and', 'or', 'not', '=>', and '<=>').
 quaternary predicateThe Class of Predicates that require four arguments.
 quintary predicateThe Class of Predicates that require five arguments.
 ternary predicateThe Class of Predicates that require exactly three arguments.


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