#18290: enhanced sets and cartesian products
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Reporter: vdelecroix | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.7
Component: categories | Resolution:
Keywords: cartesian_product | Merged in:
Authors: Vincent Delecroix | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/vdelecroix/18290 | 2eff7ab551257766a43b3d9fa7b1e637b07188b0
Dependencies: | Stopgaps:
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Comment (by vdelecroix):
Replying to [comment:18 jmantysalo]:
> Replying to [comment:16 vdelecroix]:
>
> > No. The order of enumeration of a cartesian products is lexicographic.
So a cartesian product of infinite enumerated sets should even '''not'''
be an enumerated set!
>
> OK. And after the patch at least `for x in cartesian_product([ZZ,ZZ])`
gives an error.
I will add it to the doc with a comment.
Though, for infinite sets, we can choose an other order for the
enumeration. If so, we can put back this method and implement rank/unrank.
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Ticket URL: <http://trac.sagemath.org/ticket/18290#comment:19>
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