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Ideas for 'A Puzzle about Belief', '03: Book of Leviticus' and 'Problems of Philosophy'

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10. Modality / E. Possible worlds / 1. Possible Worlds / a. Possible worlds

5400	In any possible world we feel that two and two would be four [Russell]
	Full Idea: In any possible world we feel that two and two would be four.
	From: Bertrand Russell (Problems of Philosophy [1912], Ch. 7)
	A reaction: Thinking of necessity in terms of possible worlds is not a new invention, but then Russell was a keen fan of Leibniz. Suppose there were no world at all, and only one truth, namely that two and two make five? (No, I can't make sense of that!)