Combining Philosophers

All the ideas for Saunders MacLane, Pierre Simon de Laplace and George Santayana

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6 ideas

1. Philosophy / C. History of Philosophy / 1. History of Philosophy
8000 He who is ignorant of the history of philosophy is doomed to repeat it [Santayana, by MacIntyre]
4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / a. Axioms for sets
18189 ZFC could contain a contradiction, and it can never prove its own consistency [MacLane]
7. Existence / A. Nature of Existence / 6. Criterion for Existence
18521 The criterion of existence is the possibility of action [Santayana]
13. Knowledge Criteria / C. External Justification / 7. Testimony
7458 The reliability of witnesses depends on whether they benefit from their observations [Laplace, by Hacking]
16. Persons / F. Free Will / 6. Determinism / a. Determinism
3441 If a supreme intellect knew all atoms and movements, it could know all of the past and the future [Laplace]
22. Metaethics / A. Ethics Foundations / 2. Source of Ethics / e. Human nature
23060 The good is not relative, but is rooted in facts about human needs [Santayana]