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'fragments/reports', 'Frege philosophy of mathematics' and 'The Foundations of Mathematics'
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5. Theory of Logic / A. Overview of Logic / 6. Classical Logic
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In classical logic, logical truths are valid formulas; in higher-order logics they are purely logical [Dummett]
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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
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You would cripple mathematics if you denied Excluded Middle [Hilbert]
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