Relationships




Parents 
可繼承的關係 
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 two kinds of Relation: Predicate and Function. Predicates and Functions both denote sets of ordered ntuples. The difference between these two Classes is that Predicates cover formulaforming operators, while Functions cover termforming operators.

Children 
AntisymmetricRelation  BinaryRelation ?REL is an AntisymmetricRelation if for distinct ?INST1 and ?INST2, (?REL ?INST1 ?INST2) implies not (?REL ?INST2 ?INST1). In other words, for all ?INST1 and ?INST2, (?REL ?INST1 ?INST2) and (?REL ?INST2 ?INST1) imply that ?INST1 and ?INST2 are identical. Note that it is possible for an AntisymmetricRelation to be a ReflexiveRelation. 
 BinaryPredicate  A Predicate relating two items  its valence is two. 
 經濟關係  A class of Relations which are used to specify various economic measures, e.g. the GDP, the consumer price index, and the trade deficit. 
 IntransitiveRelation  A BinaryRelation ?REL is intransitive only if (?REL ?INST1 ?INST2) and (?REL ?INST2 ?INST3) imply not (?REL ?INST1 ?INST3), for all ?INST1, ?INST2, and ?INST3. 
 IrreflexiveRelation  Relation ?REL is irreflexive iff (?REL ?INST ?INST) holds for no value of ?INST. 
 ReflexiveRelation  Relation ?REL is reflexive iff (?REL ?INST ?INST) for all ?INST. 
 SymmetricRelation  A BinaryRelation ?REL is symmetric just iff (?REL ?INST1 ?INST2) imples (?REL ?INST2 ?INST1), for all ?INST1 and ?INST2. 
 TransitiveRelation  A BinaryRelation ?REL is transitive if (?REL ?INST1 ?INST2) and (?REL ?INST2 ?INST3) imply (?REL ?INST1 ?INST3), for all ?INST1, ?INST2, and ?INST3. 
 TrichotomizingRelation  A BinaryRelation ?REL is a TrichotomizingRelation just in case all ordered pairs consisting of distinct individuals are elements of ?REL. 
 UnaryFunction  The Class of Functions that require a single argument. 