#14019: equality is broken for Posets
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Reporter: ncohen | Owner: sage-combinat
Type: defect | Status: needs_info
Priority: major | Milestone: sage-5.7
Component: combinatorics | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Nathann Cohen | Merged in:
Dependencies: | Stopgaps:
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Comment (by vbraun):
What is the expected output of the following:
{{{
sage: d = DiGraph({2:[1],3:[1]})
sage: p1 = Poset(d)
sage: p2 = p1.relabel({1:1,2:3,3:2})
sage: p1[0]
3
sage: p2[0]
2
sage: @cached_function
....: def first_element(poset):
....: return poset[0]
....:
sage: first_element(p1)
3
sage: first_element(p2)
???
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14019#comment:20>
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