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Not/Opposite/Millikan: Problem: there is no definite opposite that is mapped when "not" occurs in a sentence.
"Not" transforms a definite predicate into an indefinite.
Opposite/definite/undefinite/Millikan: Thesis: the ontological phenomenon of the opposite is fundamental to the linguistic! Not the other way around!
Property/relation/Millikan: the identity of a property or relation is tied to the identity of its opposite, and that is a truth of ontology, not of logic.
Logical subject: has no opposite.
Therefore, it is not affected by the negation.
R. G. Millikan
Language, Thought, and Other Biological Categories: New Foundations for Realism Cambridge 1987