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'Thinking About Mathematics', 'Frege philosophy of mathematics' and 'In Defence of Convention T'
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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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Intuitionists deny excluded middle, because it is committed to transcendent truth or objects [Shapiro]
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