You can say “Sherlock Holmes was correct in his deduction.” That does not rely on Sherlock Holmes actually existing, it’s just noting a relation between one concept (Sherlock Holmes) and another (a correct deduction).
This is true, but (at least if we’re channeling Descartes) the question is whether or not we can raise a doubt about the truth of the claim that something exists. Our ability to have this thought doesn’t prove that it’s true, but it may well close off any doubts.
This is true, but (at least if we’re channeling Descartes) the question is whether or not we can raise a doubt about the truth of the claim that something exists. Our ability to have this thought doesn’t prove that it’s true, but it may well close off any doubts.