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Sigma KEE  SingleValuedRelation
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SingleValuedRelation
A
Relation
is a
SingleValuedRelation
just in case an assignment of values to every argument position except the last one determines at most one assignment for the last argument position. Note that not all
SingleValuedRelation
s are
TotalValuedRelation
s.
Relationships
Parents
InheritableRelation
The class of
Relation
s 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
.
Predicate
s and
Function
s both denote sets of ordered ntuples. The difference between these two
Class
es is that
Predicate
s cover formulaforming operators, while
Function
s cover termforming operators.
Children
Function
A
Function
is a termforming
Relation
that maps from a ntuple of arguments to a range and that associates this ntuple with at most one range element. Note that the range is a
Class
, and each element of the range is an instance of the
Class
.
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