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'works', 'Set Theory and Its Philosophy' and 'Function and Concept'
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4 ideas
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 / E. Structures of Logic / 5. Functions in Logic
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First-level functions have objects as arguments; second-level functions take functions as arguments [Frege]
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5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic
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Relations are functions with two arguments [Frege]
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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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