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Full Idea
In conjunction with Extensionality, Pairing entails that given a single non-set, infinitely many sets exist.
Gist of Idea
Pairing (with Extensionality) guarantees an infinity of sets, just from a single element
Source
Gideon Rosen (The Limits of Contingency [2006], 04)
Book Ref
'Identity and Modality', ed/tr. MacBride,Fraser [OUP 2006], p.18