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Sigma KEE - observedAtTimeInPlace
?OBJ ?AGENT ?TIME ?PLACE) means that during the time specified by ?TIME, ?OBJ is observed by ?AGENT to be in the location specified by ?PLACE. Note that in the implicit
event, the physical distance between the
?OBJ and the
?AGENT might be great (e.g., a hunter using binoculars to spot Bighorn sheep on a distant mountainside). Therefore, ?PLACE denotes the specific location of ?OBJ at ?TIME, and not the possibly much more extensive region encompassed by the
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.
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'.
s that require four arguments.
s relate four items. The two
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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