This is now <http://trac.sagemath.org/ticket/20793>, patch coming soon.
Peter
Op woensdag 8 juni 2016 08:02:57 UTC+2 schreef Kiran Kedlaya:
>
> The traceback (from SMC) mostly speaks for itself.
>
> sage: N = Newforms(83,2, names="a")
> sage: f = N[1]
> sage: K = f.hecke_eigenvalue_field()
> sage: print K
>
> Number Field in a1 with defining polynomial x^6 - x^5 - 9*x^4 + 7*x^3 +
> 20*x^2 - 12*x - 8
>
> sage: l = f.coefficients(20)
>
> sage: print l[-1].parent()
>
> Number Field in alpha with defining polynomial x^6 - x^5 - 9*x^4 + 7*x^3 +
> 20*x^2 - 12*x - 8
>
> sage: K(l[-1])
>
> Error in lines 2-2
> Traceback (most recent call last):
> File
> "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/smc_sagews/sage_server.py",
> line 905, in execute
> exec compile(block+'\n', '', 'single') in namespace, locals
> File "", line 1, in <module>
> File "sage/structure/parent.pyx", line 1111, in
> sage.structure.parent.Parent.__call__
> (/projects/sage/sage-6.10/src/build/cythonized/sage/structure/parent.c:9821)
> return mor._call_(x)
> File "sage/structure/coerce_maps.pyx", line 109, in
> sage.structure.coerce_maps.DefaultConvertMap_unique._call_
> (/projects/sage/sage-6.10/src/build/cythonized/sage/structure/coerce_maps.c:4542)
> raise
> File "sage/structure/coerce_maps.pyx", line 104, in
> sage.structure.coerce_maps.DefaultConvertMap_unique._call_
> (/projects/sage/sage-6.10/src/build/cythonized/sage/structure/coerce_maps.c:4435)
> return C._element_constructor(x)
> File
> "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/rings/number_field/number_field.py",
> line 1489, in _element_constructor_
> return self._coerce_from_other_number_field(x)
> File
> "/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/rings/number_field/number_field.py",
> line 6595, in _coerce_from_other_number_field
> raise TypeError("No compatible natural embeddings found for %s and
> %s"%(KF,LF))
> TypeError: No compatible natural embeddings found for Number Field in a1 with
> defining polynomial x^6 - x^5 - 9*x^4 + 7*x^3 + 20*x^2 - 12*x - 8 and Number
> Field in alpha with defining polynomial x^6 - x^5 - 9*x^4 + 7*x^3 + 20*x^2 -
> 12*x - 8
>
>
> So why are the coefficients being created in a different copy of the same
> number field than the one returned by hecke_eigenvalue_field?
>
> Kiran
>
>
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