Combining Philosophers

All the ideas for Anaxarchus, C.S. Lewis and Hilbert,D/Ackermann,W

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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]

13. Knowledge Criteria / D. Scepticism / 1. Scepticism

3061	Anaxarchus said that he was not even sure that he knew nothing [Anaxarchus, by Diog. Laertius]

23. Ethics / C. Virtue Theory / 3. Virtues / d. Courage

15640

Courage is not a virtue, but the form of every virtue at its testing point [Lewis,CS]