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
Boole's notation can represent syllogisms and propositional arguments, but not both at once
5. Theory of Logic / A. Overview of Logic / 2. History of Logic
Boole made logic more mathematical, with algebra, quantifiers and probability