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Ideas for 'Reply to Professor Marcus', 'Models' and 'Function and Concept'

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3 ideas

5. Theory of Logic / E. Structures of Logic / 5. Functions in Logic

8490	First-level functions have objects as arguments; second-level functions take functions as arguments [Frege]

5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic

8492	Relations are functions with two arguments [Frege]

5. Theory of Logic / G. Quantification / 4. Substitutional Quantification

10801

Either reference really matters, or we don't need to replace it with substitutions [Quine]