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Ideas for 'fragments/reports', 'The Boundary Stones of Thought' and 'German Philosophy 1760-1860'

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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5

18814	'Absolute necessity' would have to rest on S5 [Rumfitt]
	Full Idea: If there is such a notion as 'absolute necessity', its logic is surely S5.
	From: Ian Rumfitt (The Boundary Stones of Thought [2015], 3.3)
	A reaction: There are plenty of people (mainly in the strict empiricist tradition) who don't believe in 'absolute' necessity.