#9677: Sage Sets don't implement genuine comparison
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Reporter: rlm | Owner: AlexGhitza
Type: defect | Status: new
Priority: major | Milestone: sage-4.5.2
Component: basic arithmetic | Keywords:
Author: Robert Miller | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by nbruin):
The noted behaviour is definitely a bug. However, the attached patch
solves this by introducing an attempt at inducing a total ordering on Sets
by sorting them first by cardinality and then by lexicographic ordering on
the sorted list of set elements. This only works if the elements of the
set have a total ordering implemented.
While python used to try to have a total ordering on all objects, this has
been abandoned (e.g. python complex numbers and python sets)
Shouldn't the sage design follow python in this respect? See also
http://groups.google.ca/group/sage-devel/msg/eab3aafb319a2769
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9677#comment:1>
Sage <http://www.sagemath.org>
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