#13644: Error when creating ideal from unhashable elements
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Reporter: saraedum | Owner: robertwb
Type: defect | Status: new
Priority: minor | Milestone: sage-5.5
Component: coercion | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Julian Rueth | Merged in:
Dependencies: | Stopgaps:
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Description changed by saraedum:
Old description:
> Currently, the following does not work because some padic extension
> elements do not define a hash function (see #11895 for why they do not
> define a hash function):
> {{{
> sage: K = Qp(3)
> sage: R.<a> = K[]
> sage: L.<a> = K.extension(a^2-3)
> sage: L.ideal(a)
> TypeError: unhashable type:
> 'sage.rings.padics.padic_ZZ_pX_CR_element.pAdicZZpXCRElement'
> }}}
>
> The problem is that {{{has_coerce_map_from}}} is looking for a coercion
> from {{{a}}} to {{{L}}}. There is none, since {{{a}}} is not a parent.
> The attached patch fixes this.
New description:
Currently, the following does not work because some padic extension
elements do not define a hash function (see #11895 for why they do not
define a hash function):
{{{
sage: K = Qp(3)
sage: R.<a> = K[]
sage: L.<a> = K.extension(a^2-3)
sage: L.ideal(a)
TypeError: unhashable type:
'sage.rings.padics.padic_ZZ_pX_CR_element.pAdicZZpXCRElement'
}}}
The problem is that {{{sage.rings.ring.Ring}}} is looking for a coercion
from {{{a}}} to {{{L}}}. There is none, since {{{a}}} is not a parent. The
attached patch fixes this.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13644#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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