#18634: bug in WeylGroups.ElementMethods.reflection_to_root
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Reporter: stumpc5 | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.8
Component: combinatorics | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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The method has the doctest
{{{
sage: W=WeylGroup(['C',2],prefix="s")
sage: r=W.from_reduced_word([1,2,1])
sage: r.reflection_to_root()
2*alpha[1] + alpha[2]
sage: r=W.from_reduced_word([1,2])
sage: r.reflection_to_root()
Traceback (most recent call last):
...
ValueError: s1*s2 is not a reflection
}}}
but if I try W.w0 instead, it runs into an infinite loop.
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Ticket URL: <http://trac.sagemath.org/ticket/18634>
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