#14019: equality is broken for Posets
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Reporter: ncohen | Owner: sage-combinat
Type: defect | Status: needs_work
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|
aa1cc73510663efb9552f12dd432109c8fd0d20d
Dependencies: #17059 | Stopgaps: #14185
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Comment (by aschilling):
There were two more doc test failures in `combinat/ordered_trees.py` due
to the non-canonical way of labeling the vertices in `canonical_label`. I
fixed those. Everything else looks ok to me.
>However the labeling itself is not unique. Consider the path on 3
vertices with
>labelings 0 - 1 - 2 and 1 - 0 - 2. The first one is no more canonical
than the second.
Precisely!
John: if you are happy now, can we set it back to positive review?
Nathann: if you are still unhappy, please change the behavior in a
different ticket. In this ticket we wanted to keep the behavior of the
posets with `_linear_extension = True` as previous.
--
Ticket URL: <http://trac.sagemath.org/ticket/14019#comment:70>
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