#14772: Remove CombinatorialClass from Permutations
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Reporter: tscrim | Owner: sage-combinat
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.11
Component: combinatorics | Resolution:
Keywords: days49 | Merged in:
Authors: Travis Scrimshaw | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Dependencies: #8386 #14519 #14808
Stopgaps: |
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Comment (by tscrim):
Replying to [comment:34 darij]:
> Should I fix this bug:
>
> {{{
> sage: S = Permutations(['c','a'])
> sage: elt = S(['c','c','c'])
> sage: elt in S
> True
> }}}
>
> or is it used in some other files to hack around permutations
restrictions similarly to how we use(d?) nonstandard permutations?
I think it should be fixed. I suspect it's something I introduced...
(especially in that case)
I also can't reproduce the avoidance part:
{{{
sage: [] in Permutations(0, avoiding=[1])
True
sage: [] in Permutations(avoiding=[1])
True
}}}
but the backtrack error is something that should be fixed. I'll see if I
can do it in a few lines, otherwise I'll say push it to another ticket.
--
Ticket URL: <http://trac.sagemath.org/ticket/14772#comment:35>
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