Combining Texts

Ideas for 'Writing the Book of the World', 'The Boundary Stones of Thought' and 'On Aristotle's 'Metaphysics''

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2 ideas

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

18814

'Absolute necessity' would have to rest on S5 [Rumfitt]

4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula

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The Barcan schema implies if X might have fathered something, there is something X might have fathered [Sider]