#20261: Coercion of 0 in cyclotomic field fails
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Reporter: fstromberg | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.2
Component: coercion | Resolution:
Keywords: cyclotomic | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Changes (by slelievre):
* keywords: => cyclotomic
* cc: bhutz, chapoton, cremona, jdemeyer, kedlaya, mmezzarobba, nbruin,
slelievre, tscrim, vdelecroix (added)
Old description:
> In some cases the element 0 of one cyclotomic field can not be coerced
> properly to 0 in another cyclotomic field.
> For instance tested in Sage 7.1:
> sage: K1=CyclotomicField(12)
> sage: K2=CyclotomicField(6)
> sage: K1(K2(0))
> 0
> sage: K2(K1(0))
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call
> last)
> ...
> TypeError: unable to coerce <class 'sage.rings.infinity.PlusInfinity'> to
> an integer
New description:
In some cases the element 0 of one cyclotomic field cannot be coerced
properly to 0
in another cyclotomic field. For instance in Sage 7.1 and Sage 7.2.rc1:
{{{
sage: K12 = CyclotomicField(12)
sage: K6 = CyclotomicField(6)
sage: K12(K6(0))
0
sage: K6(K12(0))
Traceback (most recent call last)
...
TypeError: unable to coerce <class 'sage.rings.infinity.PlusInfinity'> to
an integer
}}}
--
Comment:
Fix code typesetting in ticket description. Cc cyclotomic-interested
people.
--
Ticket URL: <http://trac.sagemath.org/ticket/20261#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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