@Night Ripper,
Night Ripper;167017 wrote:Does "This sentence expresses a proposition." express a proposition? If so, is it true or false? If not, why not? It seems to. Doesn't it?
Yes, "This sentence expresses a proposition" expresses a proposition. The proposition is that that sentence expresses a proposition. And that proposition is false, since the sentence does not express a proposition.
But in "This sentence is false", I don't see a proposition. The proposition is not "This sentence is false", since we need a proposition that is expressed by the sentence for the sentence to be false*. "This sentence is false" is meaningless without a proposition being referred to.
*Keep in mind, that as you will read below, I don't like stating sentences are true or false.
fast wrote:I don't do well with that term. It's been explained to me before, but I forget what it is.
Well, a truth-bearer is something that must be true or false (there is no third option). The best example is the proposition, but I do know that there are other views, as Emil always notes, which regard things like sentence as truth-bearers. The truth-bearer sentence view makes no sense to me, since I know that a sentence can have meaning without being true or false. And I know you agree with that (as you just noted it).
I just think we ought to call propositions true or false, and be very wary not to confuse propositions with sentences. If we attribute the properties true or false to sentences, it seems to confuse things. I'd rather consider sentences
meaningful or
meaningless.