Combining Philosophers

All the ideas for Hermarchus, Hilbert,D/Ackermann,W and Terence Parsons

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

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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]

9. Objects / A. Existence of Objects / 4. Impossible objects

18948

There is an object for every set of properties (some of which exist, and others don't) [Parsons,T, by Sawyer]

25. Social Practice / F. Life Issues / 6. Animal Rights

6005	Animals are dangerous and nourishing, and can't form contracts of justice [Hermarchus, by Sedley]