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edited Apr 13, 2017 at 12:58

The functor maps the set to a list of elements (this is not clearly always possible, see Are all sets totally ordered ?Are all sets totally ordered ?), but there is no problem with uniqueness.

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created Aug 22, 2016 at 1:54

Igor Rivin

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The functor maps the set to a list of elements (this is not clearly always possible, see Are all sets totally ordered ?), but there is no problem with uniqueness.