Keelefilosoofia raamat
since those planets are running exactly in parallel; but words on Twin Earth
and the rest diverge in meaning from their counterparts on Earth. Of an
Earth utterance and its Twin, one may be true and the other false; what more
80 Theories of meaning
could be required for difference of meaning? Thus, an expression's meaning
is not exhausted by the expression's role in a language-game.
Reply
One can classify "language-games" more finely, and deny that we and our
Twin-Earth doppelgangers are playing "the same" game, even though what
we are doing would look exactly the same if seen on television. For example,
we respond to and act upon water (H 2O), while our Twins do not, but deal
with XYZ; different rules altogether, you see. (This actually was Sellars'
original intention, though he had not yet heard of Putnam's Twin Earth.)
Objection 2
Proper names pose a problem for the "use" theorist. Try stating a rule of
use for the name "William G
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