Combining Philosophers

All the ideas for H.Putnam/P.Oppenheim, Roderick Firth and Hilbert,D/Ackermann,W

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

---

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]

12. Knowledge Sources / B. Perception / 4. Sense Data / d. Sense-data problems

6493	We are not conscious of pure liquidity, but of the liquidity of water [Firth]

14. Science / D. Explanation / 2. Types of Explanation / j. Explanations by reduction

20653

Six reduction levels: groups, lives, cells, molecules, atoms, particles [Putnam/Oppenheim, by Watson]