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'Function and Concept', 'Truth' and 'Darwin's Dangerous Idea'
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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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