#19268: MPComplexField should be a commutative ring and it is not!
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Reporter: hmonien | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.9
Component: categories | Resolution:
Keywords: MPCComplexField | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Changes (by hmonien):
* cc:
http://trac.sagemath.org/sage_trac/search?noquickjump=1&ticket=on&wiki=on&q=jdemeyer
(removed)
* cc: jdemeyer (added)
Old description:
> Even though
>
> {{{
> sage: MPC = MPComplexField(128)
> sage: MPC.is_commutative()
> True
> }}}
>
> MPC is not in commutative rings:
>
> {{{
> sage: MPC = MPComplexField(128)
>
> sage: P.<x> = PolynomialRing(ZZ, 'x')
> sage: p = x^3-5*x+1
>
> sage: p.change_ring(MPC)
> }}}
>
> gives an error
>
> {{{
> TypeError: Base ring Complex Field with 128 bits of precision must be a
> commutative ring.
> }}}
New description:
Even though
{{{
sage: MPC = MPComplexField(128)
sage: MPC.is_commutative()
True
}}}
MPC is not in commutative rings:
{{{
sage: MPC = MPComplexField(128)
sage: P.<x> = PolynomialRing(ZZ, 'x')
sage: p = x^3-5*x+1
sage: p.change_ring(MPC)
}}}
gives an error
{{{
TypeError: Base ring Complex Field with 128 bits of precision must be a
commutative ring.
}}}
--
--
Ticket URL: <http://trac.sagemath.org/ticket/19268#comment:4>
Sage <http://www.sagemath.org>
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