#7538: equality of posets is broken !
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Reporter: hivert | Owner: mhansen
Type: defect | Status: needs_info
Priority: major | Milestone: sage-4.3
Component: combinatorics | Keywords: posets
Work_issues: | Author: Florent Hivert
Upstream: N/A | Reviewer:
Merged: |
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Changes (by hivert):
* status: new => needs_info
Comment:
The fix posted here solve the problem of equality but raise a much more
subtle one
{{{
sage: p1, p2 = Posets(2).list()
sage: p2 < p1
True
sage: [[p1.__cmp__(p2) for p1 in Posets(2)] for p2 in Posets(2)]
[[0, 1], [1, 0]]
sage: [[p2.__cmp__(p1) for p1 in Posets(2)] for p2 in Posets(2)]
[[0, 1], [-1, 0]]
sage: p2 < p1
False
}}}
I forward the discussion to sage-combinat-devel.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7538#comment:1>
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