5.44
Truth-functions are not material functions.
If e.g. an affirmation can be produced by repeated denial, is the denial—in any sense—contained in the affirmation? Does “p” deny p, or does it affirm p; or both?
The proposition “p” does not treat of denial as an object, but the possibility of denial is already prejudged in affirmation.
And if there was an object called “”, then “p” would have to say something other than “p”. For the one proposition would then treat of ~, the other would not.