Combining Philosophers

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

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

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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

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

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

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