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Ideas for 'On the Question of Absolute Undecidability', 'Russell's Mathematical Logic' and 'Frege philosophy of mathematics'

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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 / A. Overview of Logic / 8. Logic of Mathematics

10035

Mathematical Logic is a non-numerical branch of mathematics, and the supreme science [Gödel]