Combining Texts
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'Two Problems of Epistemology', 'The Laws of Thought' and 'What is Logic?'
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5 ideas
4. Formal Logic / B. Propositional Logic PL / 1. Propositional Logic
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Boole applied normal algebra to logic, aiming at an algebra of thought [Boole, by Devlin]
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Boole's notation can represent syllogisms and propositional arguments, but not both at once [Boole, by Weiner]
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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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