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Ideas for 'Frege philosophy of mathematics', 'Ideas' and 'Identity and Necessity'

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5. Theory of Logic / A. Overview of Logic / 6. Classical Logic

9820	In classical logic, logical truths are valid formulas; in higher-order logics they are purely logical [Dummett]

5. Theory of Logic / F. Referring in Logic / 1. Naming / b. Names as descriptive

9175	We may fix the reference of 'Cicero' by a description, but thereafter the name is rigid [Kripke]

5. Theory of Logic / F. Referring in Logic / 1. Naming / c. Names as referential

9171	The function of names is simply to refer [Kripke]