#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 | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors: Julian Rueth
Merged in: | Dependencies:
Stopgaps: |
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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.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13644>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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