Ideas from 'Is Hume's Principle analytic?' by George Boolos , by Theme Structure
[found in 'Logic, Logic and Logic' by Boolos,George [Harvard 1999,0-674-53767-x]].
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18. Thought / D. Concepts / 6. Abstract Concepts / g. Abstracta by equivalence
An 'abstraction principle' says two things are identical if they are 'equivalent' in some respect