Combining Texts

All the ideas for 'Frege's Theory of Numbers', 'The Actual and the Possible' and 'Principles of Theoretical Logic'

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]

6. Mathematics / A. Nature of Mathematics / 4. Using Numbers / c. Counting procedure

17447

Parsons says counting is tagging as first, second, third..., and converting the last to a cardinal [Parsons,C, by Heck]

10. Modality / C. Sources of Modality / 5. Modality from Actuality

12468

A state of affairs is only possible if there has been an actual substance to initiate it [Pruss]