Ideas from 'Existence,Ontological Commitment and Fictions' by Peter van Inwagen [2003], by Theme Structure

[found in 'The Oxford Handbook of Metaphysics' (ed/tr Loux,M /Zimmerman,D) [OUP 2005,0-19-928422-9]].

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4. Formal Logic / F. Set Theory ST / 8. Critique of Set Theory
What in the real world could ground the distinction between the sets {A,{A,B}} and {B,{A,B}}?