#9940: Fix equality/inequality for AdditiveAbelianGroup
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Reporter: mpatel | Owner: joyner
Type: defect | Status: needs_work
Priority: critical | Milestone: sage-4.6.1
Component: group theory | Keywords:
Author: John Palmieri | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by jhpalmieri):
Oh, I see: `FGP_Module` is a '''function''' which returns identical
objects (via the `__init__` method of `FGP_Module_class`) if you pass it
the same input. If you do this:
{{{
sage: G=AdditiveAbelianGroup([0,0])
sage: from sage.modules.fg_pid.fgp_module import FGP_Module_class
sage: M1 = FGP_Module_class(G.V(), G.W())
sage: M2 = FGP_Module_class(G.V(), G.W())
sage: M1 == M2
True
sage: M1 != M2
True
sage: M1 < M2
True
sage: M1 > M2
False
}}}
So adding these comparisons to `FGP_Module_class` might be the right thing
to do, to deal with the case when people construct these modules without
using the helper function `FGP_Module`, using the class instead.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9940#comment:14>
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