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Ideas for
'General Facts,Phys Necessity, and Metaph of Time', 'Modes of Extension: comment on Fine' and 'The Principles of Mathematics'
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5 ideas
18. Thought / E. Abstraction / 7. Abstracta by Equivalence
18883
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Any equivalence relation among similar things allows the creation of an abstractum [Simons]
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18884
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Abstraction is usually seen as producing universals and numbers, but it can do more [Simons]
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10583
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Abstraction principles identify a common property, which is some third term with the right relation [Russell]
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10582
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The principle of Abstraction says a symmetrical, transitive relation analyses into an identity [Russell]
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10584
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A certain type of property occurs if and only if there is an equivalence relation [Russell]
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