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Ideas for 'fragments/reports', 'Grundlagen der Arithmetik (Foundations)' and 'What is Art?'

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4. Formal Logic / B. Propositional Logic PL / 1. Propositional Logic
Stoic propositional logic is like chemistry - how atoms make molecules, not the innards of atoms [Chrysippus, by Devlin]
4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / e. Axioms of PL
Chrysippus has five obvious 'indemonstrables' of reasoning [Chrysippus, by Diog. Laertius]
Frege agreed with Euclid that the axioms of logic and mathematics are known through self-evidence [Frege, by Burge]