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Naturalism/Millikan: Problem: naturalistic theories cannot be proved as true against Cartesian skepticism.
Correspondence/Millikan: no one doubts that sentences of world correspond, unless one gives up correspondence theory as a whole.
Image: it is less clear that correspondence has to do with mapping rules.
Problem: it is not clear how to describe the corresponding ontology.
R. G. Millikan
Language, Thought, and Other Biological Categories: New Foundations for Realism Cambridge 1987