#8148: looking at the dual of a poset: IndexError
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Reporter: jhpalmieri | Owner: sage-combinat
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.8
Component: combinatorics | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Changes (by brunellus):
* status: new => needs_review
Comment:
I guess this fix should help -- dual() created new Poset using FinitePoset
constructor that requires a DiGraph in its argument to be rather refined
one. Especially that the range(n) should be a linear extension of poset
defined by a DiGraph. That wasn't true, because dual() reversed the
orientation of edges. Poset constructor is much more liberal.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8148#comment:3>
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