Single Idea 18814

[catalogued under 4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5]

Full Idea

If there is such a notion as 'absolute necessity', its logic is surely S5.

Clarification

S5 is the most 'universal' system of modal logic

Gist of Idea

'Absolute necessity' would have to rest on S5

Source

Ian Rumfitt (The Boundary Stones of Thought [2015], 3.3)

Book Reference

Rumfitt,Ian: 'The Boundary Stones of Thought' [OUP 2015], p.76

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A Reaction

There are plenty of people (mainly in the strict empiricist tradition) who don't believe in 'absolute' necessity.