#18251: CombinatorialFreeModule should use coercion for comparisons
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Reporter: tscrim | Owner: tscrim
Type: defect | Status: new
Priority: critical | Milestone: sage-6.7
Component: coercion | Resolution:
Keywords: zero | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by jdemeyer:
Old description:
> Currently we have the following in Sage:
> {{{
> sage: C = CombinatorialFreeModule(QQ, ['a','b'])
> sage: C.zero() == ZZ(0)
> True
> sage: C.zero() == QQ(0)
> False
> sage: M.zero()
> (0, 0, 0, 0)
> sage: M.zero() == ZZ(0)
> True
> sage: M.zero() == QQ(0)
> False
> }}}
> What I've been doing has been implementing a custom `__eq__` which checks
> explicitly for the other argument is 0 and then checking `self.is_zero`.
> However I'm thinking we should have a general fix with this as a special
> case, but we could do it just for these element classes.
>
> Additionally this works when there a coercion from the base ring. I guess
> more generally do we want equality checking for when there is a
> conversion to the base ring? Thoughts?
New description:
Currently we have the following in Sage:
{{{
sage: C = CombinatorialFreeModule(QQ, ['a','b'])
sage: C.zero() == ZZ(0)
True
sage: C.zero() == QQ(0)
False
}}}
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Ticket URL: <https://trac.sagemath.org/ticket/18251#comment:1>
Sage <http://www.sagemath.org>
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