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18180 | Von Neumann numbers are preferred, because they continue into the transfinite [Maddy on Neumann] |
18179 | For Von Neumann the successor of n is n U {n} (rather than {n}) [Neumann, by Maddy] |
15925 | Each Von Neumann ordinal number is the set of its predecessors [Neumann, by Lavine] |