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'Lectures 1930-32 (student notes)', 'Philosophy of Mathematics' and 'Phil of Mathematics: why nothing works'
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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
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If a proposition is false, then its negation is true [Brown,JR]
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5. Theory of Logic / D. Assumptions for Logic / 3. Contradiction
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Contradiction is between two rules, not between rule and reality [Wittgenstein]
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