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KB Term:
Sigma KEE - HourFn
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HourFn
A
BinaryFunction
that assigns a
PositiveRealNumber
and a subclass of
Day
s to the
Hour
s within each
Day
corresponding to that
NonnegativeInteger
. For example, (
HourFn
12
Thursday
) is the
Class
of all instances of noon Thursday. For another example, (
HourFn
0
Day
) would return the class of all instances of midnight. For still another example, (
HourFn
14 (
DayFn
18 (
MonthFn
August
(
YearFn
1912)))) denotes 2 PM on the 18th day of August 1912.
Relationships
Instances
Abstract
Properties or qualities as distinguished from any particular embodiment of the properties/qualities in a physical medium. Instances of Abstract can be said to exist in the same sense as mathematical objects such as sets and relations, but they cannot exist at a particular place and time without some physical encoding or embodiment.
BinaryFunction
The
Class
of
Function
s that require two arguments.
Entity
La clase universal de individuos. Es el nodo principal de la ontologĂa.
Function
A
Function
is a term-forming
Relation
that maps from a n-tuple of arguments to a range and that associates this n-tuple 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
.
InheritableRelation
The class of
Relation
s whose properties can be inherited downward in the class hierarchy via the
subrelation
Predicate
.
PartialValuedRelation
A
Relation
is a
PartialValuedRelation
just in case it is not a
TotalValuedRelation
, i.e. just in case assigning values to every argument position except the last one does not necessarily mean that there is a value assignment for the last argument position. Note that, if a
Relation
is both a
PartialValuedRelation
and a
SingleValuedRelation
, then it is a partial function.
Relation
The
Class
of relations. There are two kinds of
Relation
:
Predicate
and
Function
.
Predicate
s and
Function
s both denote sets of ordered n-tuples. The difference between these two
Class
es is that
Predicate
s cover formula-forming operators, while
Function
s cover term-forming operators.
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.
TemporalRelation
The
Class
of temporal
Relation
s. This
Class
includes notions of (temporal) topology of intervals, (temporal) schemata, and (temporal) extension.
TernaryRelation
TernaryRelation
s relate three items. The two
subclass
es of
TernaryRelation
are
TernaryPredicate
and
BinaryFunction
.
Belongs to Class
Entity
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