#19737: SetPartition.to_permutation().cycle_tuples() is not the identity
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Reporter: mantepse | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-7.0
Component: combinatorics | Resolution:
Keywords: set partitions, | Merged in:
permutations | Reviewers:
Authors: Martin Rubey | Work issues:
Report Upstream: N/A | Commit:
Branch: | 26169d76d77d69d32ef5b7dc75d7f5faad8ee909
u/mantepse/setpartition_to_permutation___cycle_tuples___is_not_the_identity|
Stopgaps:
Dependencies: |
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Comment (by mantepse):
Replying to [comment:13 ncohen]:
> The requirement is not that the ground set be totally ordered. The
requirement is that the ground set should be `{1,...,n}`.
Oh, I missed that, I thought that Permutation would handle bijections, not
just Permutations of `{1,...,n}`. That's really strange, I must say.
Hm, now I'm not sure what should be done. I guess, the only reasonable
thing then is to fail when the ground set is not of this form. Well, that
might make sense anyway.
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Ticket URL: <http://trac.sagemath.org/ticket/19737#comment:14>
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