This is mainly a negative criterion, i.e., something outside the undergraduate 
curriculum probably should not be in our core libraries. But I would guess for 
example mathematicians cover Gödel's theorem, which we would not want to move 
to our core libraries.


> On 18 Jan 2018, at 13:31, Tobias Nipkow <> wrote:
> It sounds like a reasonable criterion. Can you tell us what that means for 
> Hausdorff_Distance, Metric_Completion and Isometries (as detailed by Fabian)?

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