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Ideas for 'Essays on Intellectual Powers: Conception', 'Logicism in the 21st Century' and 'The Disorder of Things'

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18. Thought / C. Content / 5. Twin Earth

17378

Presumably molecular structure seems important because we never have the Twin Earth experience [Dupré]

18. Thought / E. Abstraction / 7. Abstracta by Equivalence

8786	One first-order abstraction principle is Frege's definition of 'direction' in terms of parallel lines [Hale/Wright]