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11 December 2025

diffhist Ordinal number 08:40 −27 Tosiaki! talk contribs (→Basic properties: Merging these two parts to emphasize the only important fact)
diffhist Ordinal number 08:33 −13,292 Tosiaki! talk contribs (→Von Neumann definition of ordinals: abbreviating section)

10 December 2025

diffhist Ordinal number 20:55 +24 Americanastronaut talk contribs (IMO describing this property as "proper subsets are elements" is incredibly misleading/confusing for a casual reader, who is likely to interpret it literally as saying that an arbitrary proper subset of an ordinal must also be an element of that ordinal. In my experience teaching, this kind of elementary confusion is extremely common and great pains should be taken to avoid it whenever possible.)