Combining Philosophers

Ideas for Richard Price, T.H. Huxley and Shaughan Lavine

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2 ideas

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]