Philosophy
The Logic of Fictional Discourse and Truth in Fiction
Quick fact
In David Lewis's influential analysis, a sentence like 'Sherlock Holmes lived at Baker Street' is true in the real world because it is true in the closest possible world where the Sherlock Holmes stories are told as known fact, rather than as fiction.
Why this is interesting
We all agree that Sherlock Holmes lives at 221B Baker Street—yet he never existed. How can a sentence about a fictional character be true?