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Ideas for 'Logic (Encyclopedia I)', 'Frege philosophy of mathematics' and 'Ars Magna'

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5. Theory of Logic / A. Overview of Logic / 2. History of Logic

19369

Lull's combinatorial art would articulate all the basic concepts, then show how they combine [Lull, by Arthur,R]

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]