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'fragments/reports', 'Understanding the Infinite' and 'Significance of the Kripkean Nec A Posteriori'
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5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic
15926
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Second-order logic presupposes a set of relations already fixed by the first-order domain [Lavine]
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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]
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