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Ideas for 'Are there propositions?', 'Beauty: a very short introduction' and 'On the Source of Necessity'

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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / g. System S4

15102	S4 says there must be some necessary truths (the actual ones, of which there is at least one) [Cameron]
	Full Idea: S4 says there must be some necessary truths, because the actual necessary truths must be necessary. (It says if there are some actual necessary truths then that is so - but the S4 axiom is an actual necessary truth, if true).
	From: Ross P. Cameron (On the Source of Necessity [2010], 2)