#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):
Generally, `==` should mean identical and not just isomorphic. Up to
automorphism there is only one set of a given size. But surely we don't
want all sets of fixed size to compare equal, right?
Any two objects that satisfy `==` may be substituted for each other in
cached method calls.
If you want "isomorphic with possibly non-unique isomorphism" then just
implement a `is_isomorphic()` method.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14019#comment:16>
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