Yes that is the typical reply. But why does it fail Dr. Casey’s definition for proposition?
If a proposition is “Something that is affirmed or denied of something else,” then why is “This sentence is false” not something that is affirmed or denied of something else?
Couldn’t someone argue that the “something” is “this sentence” and the “something else” is “false.”
I agree that it is meaningless, but I would love to be able to explain why it is NOT a proposition according to how we define propositions.