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But that
idea is problematic. Here is a more specific worry about the "dynamic fea-
ture," pointed out by Michael Dummett (1975) and by Hilary Putnam (1978).
Dummett's and Putnam's own writings are dense and somewhat obscure, but
here is a simple way of putting one of their concerns: A sentence meaning is
what one knows when one knows what a sentence means. But to know what
a sentence means is just to understand that sentence. And understanding is
a psychological state, one that inheres in a flesh-and-blood human organism
and affects that organism's behavior. Now, if what a sentence means is just
its truth condition, how can knowledge of a truth condition per se affect
anyone's behavior, when (as is easily shown by Twin-Earth examples) truth
conditions are often "wide" properties of sentences in the sense that they
"ain't in the head" and knowledge of truth conditions is a conspicuously
wide property of people? The truth condition of "Dogs drink water," here,