Prove that if X is a set of ordinals, then supX is an ordinal larger than all elements of X (and therefore not in X).

Any help would be much appreciated.

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- October 25th 2009, 08:59 PMqwe123Help with ordinals
Prove that if X is a set of ordinals, then supX is an ordinal larger than all elements of X (and therefore not in X).

Any help would be much appreciated. - October 25th 2009, 09:29 PMtonio