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Ideas for 'The Middle Works (15 vols, ed Boydston)', 'Investigations into Logical Deduction' and 'Philosophical Implications of Mathematical logic'

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5. Theory of Logic / C. Ontology of Logic / 1. Ontology of Logic

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Logic is highly general truths abstracted from reality [Russell, by Glock]

5. Theory of Logic / H. Proof Systems / 4. Natural Deduction

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Natural deduction shows the heart of reasoning (and sequent calculus is just a tool) [Gentzen, by Hacking]