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'Thinking About Mathematics', 'Inventing Logical Necessity' and 'Whitehead and the Rise of Modern Logic'
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5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic
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Quine says higher-order items are intensional, and lack a clearly defined identity relation [Quine, by Shapiro]
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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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