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'fragments/reports', 'Presidential Address of Am. Math. Soc' and 'Why there isn't a ready-made world'
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3 ideas
5. Theory of Logic / A. Overview of Logic / 2. History of Logic
10247
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We have no adequate logic at the moment, so mathematicians must create one [Veblen]
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5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
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Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]
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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
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Every proposition is either true or false [Chrysippus, by Cicero]
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