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Ordinals?
edit"Another example are the ordinals under the usual operations of ordinal arithmetic." Since the class of all ordinals is not a set, it isn't clear what is meant by this so-called example. Does anyone want to clarify or should the sentence just be deleted? Michael Kinyon (talk) 03:34, 28 March 2014 (UTC)
- Explained. Paolo Lipparini (talk) 12:23, 11 March 2015 (UTC)