Combining Texts

Ideas for 'Through the Looking Glass', 'A Theory of Universals' and 'Begriffsschrift'

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3 ideas

4. Formal Logic / C. Predicate Calculus PC / 1. Predicate Calculus PC

4971	I don't use 'subject' and 'predicate' in my way of representing a judgement [Frege]

4. Formal Logic / C. Predicate Calculus PC / 2. Tools of Predicate Calculus / d. Universal quantifier ∀

17745

For Frege, 'All A's are B's' means that the concept A implies the concept B [Frege, by Walicki]

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / g. System S4

15544

If what is actual might have been impossible, we need S4 modal logic [Armstrong, by Lewis]