#14019: equality is broken for Posets
-------------------------------------+-------------------------------------
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|
c5c6a0c6c0cc48a2ce6a89652aaccb48b35b987a
Dependencies: #17059 | Stopgaps: #14185
-------------------------------------+-------------------------------------
Comment (by ncohen):
Hello,
> It depends on what we want to actually check. Yet as currently stated in
the documentation of `is_isomorphic`, it does return the correct value as
it checks "if both posets are isomorphic". My thought is that ''if'' we
decide we want to also check with a specified linear extension, then we
add another argument to `is_isomorphic`. At present, the method should not
raise an error, and this should probably be done on another ticket.
Well. I am convinced that you understand what is happening right now, and
that you know how and why it is that while two posets object `P1,P2` may
be reported to be isomorphic by Sage, it does not necessarily mean that
there is a relabelling of one that makes it equal to the other. I will not
fight for the bugs of this 'poset with linear extension' feature.
Nathann
--
Ticket URL: <http://trac.sagemath.org/ticket/14019#comment:74>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
