# KEHOME/knowledge/ExamplesDefinition/rhm.txt
# 1999/6/10

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# Richard H. McCullough definitions #
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A concept is an exclusive mental integration
of two or more similar units.
Note that the units are unordered.
The KR expression of a concept is
  concept is either unit:1 or unit:2 or ...

A group is an inclusive mental integration
of two or more similar units (members).
Note that the members may be either ordered
(e.g., a sequence) or unordered (e.g., a set).
The KR expression of a group is
  group is all member:1 and member:2 and ...

A sequence is a group with numerically ordered members.

A set is a group with unordered members.

A proposition is a sequence of mental units assembled
using rules of grammar; each mental unit is either
  a nocept (no referents in reality) or
  a percept (one particular referent in reality) or
  a concept (disjunction of two or more referents in reality) or
  a group (conjunction of two or more referents in reality).
A proposition consists of two parts: a sentence,
and the context (space,time,view) of the sentence.

Believability is a (contextual, psychological) measurement
assigned by a person to a statement, which defines that
person's degree of certainty that the statement is a
fact of reality.  Believability is a real number ranging
from -1.0 (certainly false) to +1.0 (certainly true).