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Ideas for 'fragments/reports', 'Logical Necessity' and 'Model Theory for Modal Logic I'

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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle

6023	Every proposition is either true or false [Chrysippus, by Cicero]

5. Theory of Logic / D. Assumptions for Logic / 3. Contradiction

12194

Contradictions include 'This is red and not coloured', as well as the formal 'B and not-B' [Rumfitt]