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'Reportatio', 'Essays on Intellectual Powers 1: Preliminary' and 'Set Theory and Its Philosophy'
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5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic
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We can formalize second-order formation rules, but not inference rules [Potter]
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5. Theory of Logic / H. Proof Systems / 3. Proof from Assumptions
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Supposing axioms (rather than accepting them) give truths, but they are conditional [Potter]
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