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Ideas for 'Dialektik', 'The Principles of Mathematics' and 'The Justification of Deduction'

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3 ideas

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

10583

Abstraction principles identify a common property, which is some third term with the right relation [Russell]

10582

The principle of Abstraction says a symmetrical, transitive relation analyses into an identity [Russell]

10584

A certain type of property occurs if and only if there is an equivalence relation [Russell]