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Formal Language:
OWL
SUO-KIF
TPTP
traditionalLogic
KB Term:
Sigma KEE - List
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List
Every
List
is a particular ordered n-tuple of items. Generally speaking,
List
s are created by means of the
ListFn
Function
, which takes any number of items as arguments and returns a
List
with the items in the same order. Anything, including other
List
s, may be an item in a
List
. Note too that
List
s are extensional - two lists that have the same items in the same order are identical. Note too that a
List
may contain no items. In that case, the
List
is the
NullList
.
Relationships
Parents
Relation
The
Class
of relations. There are three kinds of
Relation
:
Predicate
,
Function
, and
List
.
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. A
List
, on the other hand, is a particular ordered n-tuple.
Children
Album
An
Album
is a
List
of
Recording
s that are packaged and sold as a unit.
MusicChart
MusicChart
is a ranked list of
Album
or
MusicRecording
that is deemed the most popular by some criteria, such as the number of sales or the airplay it receives from radio stations, and the like.
SRPResults
A
List
containing
WebListing
s or
WebPage
s the is the result of a
BestMatchAlgorithm
, and is a
component
of a
SearchResultsPage
.
UniqueList
A
List
in which no item appears more than once,i.e. a
List
for which there are no distinct numbers ?NUMBER1 and ?NUMBER2 such that (
ListOrderFn
?LIST ?NUMBER1) and (
ListOrderFn
?LIST ?NUMBER2) return the same value.
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Sigma version 2.99c (>= 2017/11/20) is
open source software
produced by
Articulate Software
and its partners