Ideas from 'Notice of Fine's 'Limits of Abstraction'' by R Cook / P Ebert [2004], by Theme Structure
		
		[found in 'British Soc for the Philosophy of Science' (ed/tr -)  [- ,]].
		
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		18. Thought / E. Abstraction / 7. Abstracta by Equivalence
		
	
	
		| 9141 | Abstraction theories build mathematics out of second-order equivalence principles |