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Ideas for 'fragments/reports', 'Philosophical Fragments' and 'The Principles of Mathematics'

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3 ideas

5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens

8078	Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]

5. Theory of Logic / B. Logical Consequence / 8. Material Implication

14106

Implication cannot be defined [Russell]

14108

It would be circular to use 'if' and 'then' to define material implication [Russell]