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Ideas for 'Structures and Structuralism in Phil of Maths', 'Reply to Professor Marcus' and 'On Signs (damaged)'

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2 ideas

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]

5. Theory of Logic / G. Quantification / 5. Second-Order Quantification

10175

Three types of variable in second-order logic, for objects, functions, and predicates/sets [Reck/Price]