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KB Term:
FrontFn
Sigma KEE - FrontFn
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FrontFn
Una
Function
que mapea un
Object
al lado que generalmente recibe la mayoría de la atención o que típicamente está orientado al mismo sentido en la que el
Object
se mueve. Note que esta es una función parcial porque algunos
Object
s no tienen lados, por ejemplo, manzanas y esféricos. Note que el rango de la
Function
es indefinido en la misma manera que
ImmediateFutureFn
y
ImmediatePastFn
son indefinidos. Aunque este estado indefinido es indeseable desde el punto de vista teórico, no hay implicaciones practicas y significativa desde que hay acuerdo intersubjetivo en casi todas las veces.
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.
BinaryRelation
BinaryRelation
s are relations that are true only of pairs of things.
BinaryRelation
s are represented as slots in frame systems.
Entity
La clase universal de individuos. Es el nodo principal de la ontología.
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.
SpatialRelation
The
Class
of
Relation
s that are spatial in a wide sense. This
Class
includes mereological relations and topological relations.
UnaryFunction
The
Class
of
Function
s that require a single argument.
Belongs to Class
Entity
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Sigma version 3.0 is
open source software
produced by
Articulate Software
and its partners