Combining Texts

Ideas for 'Three Varieties of Knowledge', 'On Interpretation' and 'Introduction to Mathematical Philosophy'

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3 ideas

4. Formal Logic / A. Syllogistic Logic / 1. Aristotelian Logic

22272

Aristotle's later logic had to treat 'Socrates' as 'everything that is Socrates' [Potter on Aristotle]

9405	Square of Opposition: not both true, or not both false; one-way implication; opposite truth-values [Aristotle]

4. Formal Logic / A. Syllogistic Logic / 2. Syllogistic Logic

14453

The Darapti syllogism is fallacious: All M is S, all M is P, so some S is P' - but if there is no M? [Russell]