Combining Texts

All the ideas for 'Isagoge ('Introduction')', 'Principles of Theoretical Logic' and 'plays (frags)'

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3 ideas

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

17750

The first clear proof of the consistency of the first order predicate logic was in 1928 [Hilbert/Ackermann, by Walicki]

8. Modes of Existence / D. Universals / 1. Universals

15034

Are genera and species real or conceptual? bodies or incorporeal? in sensibles or separate from them? [Porphyry]

10. Modality / C. Sources of Modality / 2. Necessity as Primitive

74	Even God could not undo what has been done [Agathon]