Combining Texts

Ideas for 'Mahaprajnaparamitashastra', 'Nietzsche's Immoralism' and 'works'

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

11002	Equating necessity with informal provability is the S4 conception of necessity [Lewis,CI, by Read]
	Full Idea: C.I.Lewis's S4 system develops a sense of necessity as 'provability' in some fairly informal sense.
	From: report of C.I. Lewis (works [1935]) by Stephen Read - Thinking About Logic Ch. 4