Ideas from 'Is Hume's Principle analytic?' by George Boolos [1997], by Theme Structure
[found in 'Logic, Logic and Logic' by Boolos,George [Harvard 1999,0-674-53767-x]].
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18. Thought / E. Abstraction / 7. Abstracta by Equivalence
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An 'abstraction principle' says two things are identical if they are 'equivalent' in some respect
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