Combining Texts

All the ideas for 'Principles of Theoretical Logic', 'A Realistic Theory of Categories' and 'Metaphysical Foundations of Mathematics'

expand these ideas     |    start again     |     specify just one area for these texts

---

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]

7. Existence / E. Categories / 3. Proposed Categories

13120

Chisholm divides things into contingent and necessary, and then individuals, states and non-states [Chisholm, by Westerhoff]

27. Natural Reality / D. Time / 2. Passage of Time / g. Time's arrow

22908

When one element contains the grounds of the other, the first one is prior in time [Leibniz]