Combining Texts
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'Thinking About Mathematics', 'On the Source of Necessity' and 'The Boundary Stones of Thought'
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / g. System S4
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S4 says there must be some necessary truths (the actual ones, of which there is at least one) [Cameron]
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5
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'Absolute necessity' would have to rest on S5 [Rumfitt]
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