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Ideas for 'fragments/reports', 'Logicism in the 21st Century' and 'A Structural Account of Mathematics'

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

9568	I prefer the open sentences of a Constructibility Theory, to Platonist ideas of 'equivalence classes' [Chihara]

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