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Ideas for 'fragments/reports', 'Thinking About Logic' and 'Aristotle and Kant on the Source of Value'

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10. Modality / A. Necessity / 2. Nature of Necessity

11001	Equating necessity with truth in every possible world is the S5 conception of necessity [Read]
	Full Idea: The equation of 'necessity' with 'true in every possible world' is known as the S5 conception, corresponding to the strongest of C.I.Lewis's five modal systems.
	From: Stephen Read (Thinking About Logic [1995], Ch.4)
	A reaction: Are the worlds naturally, or metaphysically, or logically possible?