Combining Philosophers

Ideas for Melvin Fitting, Stephen P. Schwartz and Michael Dummett

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3 ideas

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]

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

11026

Classical logic is deliberately extensional, in order to model mathematics [Fitting]