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Reduction/Schiffer: ... no more should be required than that theoretical terms (TT) are physically realized - but realization does not imply reducibility - Schiffer pro Brentano: in favour of irreducibility of the intentional vocabulary.
Eliminativism/Churchland: is quite different: intentional vocabulary is not reducible - but folk psychology (functional theory) will turn out to be wrong. - SchifferVsChurchland: why should irreducibility imply unrealizability?
Remnants of Meaning Cambridge 1987