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'fragments/reports', 'Logical Necessity' and 'Introduction to Zermelo's 1930 paper'
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2 ideas
5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
6023
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Every proposition is either true or false [Chrysippus, by Cicero]
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5. Theory of Logic / D. Assumptions for Logic / 3. Contradiction
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Contradictions include 'This is red and not coloured', as well as the formal 'B and not-B' [Rumfitt]
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