#12838: Root poset should treat type A1 properly
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Reporter: stumpc5 | Owner: sage-combinat
Type: defect | Status: new
Priority: major | Milestone: sage-5.0
Component: combinatorics | Keywords: root poset
Work issues: | Report Upstream: N/A
Reviewers: | Authors: Christian Stump
Merged in: | Dependencies:
Stopgaps: |
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The patch fixes the issue that the one element root poset in type A1 was
not returned correctly.
{{{
sage: Phi = RootSystem(['A',1]).root_poset(); Phi
Finite poset containing 1 elements
sage: Phi.cover_relations()
[]
}}}
I also added the facade option for root posets.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12838>
Sage <http://www.sagemath.org>
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