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Sigma KEE - instance
An object is an
if it is included in that
. An individual may be an
of many classes, some of which may be subclasses of others. Thus, there is no assumption in the meaning of
about specificity or uniqueness.
(element ?ENTITY ?SET) is true just in case ?ENTITY is contained in the
can be an
only if the latter is a
An object is an
if it is an
and it is not an
of a proper subclass of
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.
relating two items - its valence is two.
s are relations that are true only of pairs of things.
s are represented as slots in frame systems.
The universal class of individuals. This is the root node of the ontology.
The class of
s whose properties can be inherited downward in the class hierarchy via the
is a sentence-forming
. Each tuple in the
is a finite, ordered sequence of objects. The fact that a particular tuple is an element of a
is denoted by '(*predicate* arg_1 arg_2 .. arg_n)', where the arg_i are the objects so related. In the case of
s, the fact can be read as `arg_1 is *predicate* arg_2' or `a *predicate* of arg_1 is arg_2'.
of relations. There are three kinds of
s both denote sets of ordered n-tuples. The difference between these two
es is that
s cover formula-forming operators, while
s cover term-forming operators. A
, on the other hand, is a particular ordered n-tuple.
Belongs to Class
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