Constraint on concept possession (and hence on the ability to entertain genuine thoughts) to the effect that a subject has the concept C only if the set of thoughts the subject is able to entertain is closed under recombination of C with all other semantically and categorically appropriate concepts that the subject possesses.
Rick Grush & Pete Mandik
A type of counter example to the definition of knowledge as justified true belief.
<Details> Chris Eliasmith
Good Old-Fashioned Artificial Intelligence. See symbolicism, artificial intelligence.