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 ntuples. The difference between these two Classes is that Predicates cover formulaforming operators, while Functions cover termforming operators. A List, on the other hand, is a particular ordered ntuple.

Children 
antisymmetric relation  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. 
 binary predicate  A Predicate relating two items  its valence is two. 
 economic relation  A class of Relations which are used to specify various economic measures, e.g. the GDP, the consumer price index, and the trade deficit. 
 intransitive relation  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. 
 irreflexive relation  Relation ?REL is irreflexive iff (?REL ?INST ?INST) holds for no value of ?INST. 
 reflexive relation  Relation ?REL is reflexive iff (?REL ?INST ?INST) for all ?INST. 
 symmetric relation  A BinaryRelation ?REL is symmetric just iff (?REL ?INST1 ?INST2) imples (?REL ?INST2 ?INST1), for all ?INST1 and ?INST2. 
 transitive relation  A BinaryRelation ?REL is transitive if (?REL ?INST1 ?INST2) and (?REL ?INST2 ?INST3) imply (?REL ?INST1 ?INST3), for all ?INST1, ?INST2, and ?INST3. 
 trichotomizing relation  A BinaryRelation ?REL is a TrichotomizingRelation just in case all ordered pairs consisting of distinct individuals are elements of ?REL. 
 unary function  The Class of Functions that require a single argument. 