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'fragments/reports', 'The Principles of Mathematics' and 'Truthmaking for Presentists'
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3 ideas
5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
8078
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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 / B. Logical Consequence / 8. Material Implication
14106
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Implication cannot be defined [Russell]
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14108
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It would be circular to use 'if' and 'then' to define material implication [Russell]
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