Combining Philosophers

Ideas for Ariston, PG and Michael Dummett

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5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic

11066

Deduction is justified by the semantics of its metalanguage [Dummett, by Hanna]

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]