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Ideas for 'Structures and Structuralism in Phil of Maths', 'Speaking of Objects' and 'On Second-Order Logic'

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2 ideas

5. Theory of Logic / G. Quantification / 2. Domain of Quantification

10832

'∀x x=x' only means 'everything is identical to itself' if the range of 'everything' is fixed [Boolos]

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]