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Ideas for 'fragments/reports', 'Understanding the Infinite' and 'The Emergence of Probability'

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5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic

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Second-order logic presupposes a set of relations already fixed by the first-order domain [Lavine]

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

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Mathematical proof by contradiction needs the law of excluded middle [Lavine]