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Ideas for 'fragments/reports', 'Grundrisse' and 'Our Knowledge of the External World'

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5 ideas

5. Theory of Logic / A. Overview of Logic / 3. Value of Logic

21588

Logic gives the method of research in philosophy [Russell]

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 / D. Assumptions for Logic / 2. Excluded Middle

6023	Every proposition is either true or false [Chrysippus, by Cicero]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives

21586

The logical connectives are not objects, but are formal, and need a context [Russell]

5. Theory of Logic / L. Paradox / 4. Paradoxes in Logic / a. Achilles paradox

21585

The tortoise won't win, because infinite instants don't compose an infinitely long time [Russell]