#14019: equality is broken for Posets
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Reporter: ncohen | Owner: sage-combinat
Type: defect | Status: positive_review
Priority: major | Milestone: sage-6.4
Component: combinatorics | Resolution:
Keywords: posets | Merged in:
Authors: Travis Scrimshaw, | Reviewers: Travis Scrimshaw,
Anne Schilling | Anne Schilling
Report Upstream: N/A | Work issues:
Branch: | Commit:
public/combinat/poset/fix_equality-14019|
b1eefd78cd65736b44153761b929de1c4387cb70
Dependencies: #17059 | Stopgaps: #14185
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Comment (by ncohen):
Also, I do not understand what you do in the `.dual()` function. You seem
to define a `elements` variable that you do not use. As a result the dual
of a Poset with a linear extension becomes a poset without linear
extension.
Would it also be possible to change the `__repr__` function so that is
says explicitly that the poset is a `poset with a linear extension` ? The
two posets behave as if they were of different type (they can never be
equal), and if such a poset is returned by a function it may surprise the
user that the poset is never equal to a poset he built himself.
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/14019#comment:44>
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