Keelefilosoofia raamat
when an implicatum is false. When S1 entails S2 and S2 is false, the penalty is
that S1 is false. When S1 semantically presupposes S2 and S2 is false, then S1 is
sent ignominiously to zip. When someone utters S1, thereby conversationally
implicating S2 , and the conveyed meaning or invited inference S2 is false, then
the penalty is that, even if S1 is true, the speaker's utterance is misleading. If
S1 conventionally implicates S2 and S2 is false, then S1 is misworded, even if
not false.
A further type of "pragmatic presupposition" not already mentioned here
might be called "illocutionary implication": The performing of a speech act
in some sense implies the satisfaction of its distinctive felicity conditions.
For example, my promising to return your champagne glasses implies that
I intend to return them, and does so noncancelably (I cannot add, " . . . but
don't get me wrong; I have no intention of returning them"). To our penalty