Ideas from 'The Laws of Thought' by George Boole [1854], by Theme Structure

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4. Formal Logic / B. Propositional Logic PL / 1. Propositional Logic
Boole applied normal algebra to logic, aiming at an algebra of thought [Devlin]
Boole's notation can represent syllogisms and propositional arguments, but not both at once [Weiner]
5. Theory of Logic / A. Overview of Logic / 2. History of Logic
Boole made logic more mathematical, with algebra, quantifiers and probability [Friend]