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Ideas for
'What is Logic?st1=Ian Hacking', 'Essays on Intellectual Powers 2: Senses' and 'Trees, Terms and Truth'
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5 ideas
4. Formal Logic / A. Syllogistic Logic / 1. Aristotelian Logic
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Traditional term logic struggled to express relations [Engelbretsen]
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4. Formal Logic / A. Syllogistic Logic / 3. Term Logic
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Term logic rests on negated terms or denial, and that propositions are tied pairs [Engelbretsen]
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4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / d. Basic theorems of PL
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'Thinning' ('dilution') is the key difference between deduction (which allows it) and induction [Hacking]
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Gentzen's Cut Rule (or transitivity of deduction) is 'If A |- B and B |- C, then A |- C' [Hacking]
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Only Cut reduces complexity, so logic is constructive without it, and it can be dispensed with [Hacking]
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