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May 20, 2023 at 18:31 comment added David Gudeman @KristianBerry, yes, in a sense it's a trivial point, or at least it's a point about syntax rather than meaning or truth. They aren't saying that you cannot negate a sentence, just that there is no specific syntactic operator of the form "not X" to negate a sentence X. In English, of course, you can't say "not I'm hungry" like you can in propositional logic.
May 20, 2023 at 14:59 comment added Kristian Berry OK, so I think your answer is correct because it tracks the details more closely than my interpretation did, and so I think my interpretation must be off. Maybe, "No," does have a monadic sentence-level negation function but there's a subtle difference compared to what the SEP is talking about. Maybe not an important difference, but it's there.
May 20, 2023 at 14:58 vote accept Kristian Berry
May 20, 2023 at 14:55 comment added Kristian Berry But actually, I'm not sure I'm reading the SEP article correctly. I guess I would look at, "No," like in function notation, so like, "No(S)," for some S, and then I don't know how much difference there is between a monadic function operator and a one-place connective???
May 20, 2023 at 14:47 comment added Kristian Berry Isn't a one-place connective an operator that attaches to one sentence to yield a new sentence?
May 20, 2023 at 14:39 comment added David Gudeman @KristianBerry, do you know what a one-place connective is? My answer assumes you do, but these responses seem to indicate otherwise. I didn't say that "no" doesn't negate a sentence; I said that it's not a one-place connective, which is exactly what the SEP quote says doesn't exist.
May 20, 2023 at 14:31 comment added Kristian Berry Or if, instead of asking questions, we had someone say, "The moon is blue," and then someone says, "No," to that. This would lead to, "The moon is not blue," or a positive claim about another color. But so I still don't see how the initial, "No," fails to negate the original sentence. I mean, imagine, "The moon is blue," and then, "No, the moon is blue." Would that make sense?
May 20, 2023 at 14:28 comment added Kristian Berry The SEP article on questions says that for some reason, "Most authors require answers to be sentences or propositions, so that answers to a question are the kind of thing that is true or false. Tichy (1978) is a striking exception and argues that answers can be of any logical type," incl. single words/noun-phrases. But so why would a one-word sentence, "No," fail to count as a negation of a previous possible sentence?
May 20, 2023 at 14:09 history answered David Gudeman CC BY-SA 4.0