Combining Philosophers

All the ideas for Hilbert,D/Ackermann,W, Agathon and Pierre-Joseph Proudhon

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]

10. Modality / C. Sources of Modality / 2. Necessity as Primitive

74	Even God could not undo what has been done [Agathon]

25. Social Practice / C. Rights / 4. Property rights

20523

Property is theft! [Proudhon]