On Ch. 4 of Lewis’s book Counterfactuals (1973) and the essays “Scorekeeping in a Language Game” (1979) and “Truth in Fiction” (1978).
What makes a sentence about possibility true? Lewis thinks that we need possible worlds that really exist in order to make sense of our modal intuitions. He uses this possible-world talk to make sense of conversations and the worlds created by fiction writers. With guest Matt Teichman from Elucidations.
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