John Creighto
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sigurdW said:It gave me some headache too: its better to not use exactly that representation, use the following instead:
"This" in the sentence "This sentence is false” refers to "This sentence is false”
It means the same thing! Has the same effect. Its an alternative formulation of the liar identity defining “This sentence is false”.
This seems to get us closer to the abstract form yet it is further a way from the concrete form. We could be more explicit and write:
"This" in the sentence "This sentence is false” is logically equivalent to "This sentence is false”.
but then the question is why do this. Perhaps this historical example given in Wikipedia is a better way to state the paradox:
Eubulides reportedly asked, "A man says that he is lying. Is what he says true or false?"
Yet one might answer Eubulides by saying that the man is lying by omission.