#16509: bug in .as_finite_field_element() when minimal=True
-------------------------------------+-------------------------------------
Reporter: vdelecroix | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.3
Component: finite rings | Resolution:
Keywords: bug | Merged in:
Authors: Peter Bruin | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/pbruin/16509-as_finite_field_element|
5572837f991d5ed6a1674e009de8c38e0c3bbc7c
Dependencies: | Stopgaps:
-------------------------------------+-------------------------------------
Changes (by {'newvalue': u'Peter Bruin', 'oldvalue': ''}):
* status: new => needs_review
* commit: => 5572837f991d5ed6a1674e009de8c38e0c3bbc7c
* branch: => u/pbruin/16509-as_finite_field_element
* author: => Peter Bruin
Old description:
> {{{
> sage: K = GF(5).algebraic_closure()
> sage: z=K.gen(5) - K.gen(5) + K.gen(2)
> sage: z.as_finite_field_element(minimal=True)
> Traceback (most recent call last):
> ...
> TypeError: unable to coerce
> }}}
>
> The problem comes from the fact that the finite subfields of the
> algebraic closure can not talk to each other.
>
> Note that hopefully, it works fine when `minimal=False` (which is the
> default).
New description:
`AlgebraicClosureFiniteField.as_finite_field_element(minimal=True)` fails
when it needs to convert between two non-trivial finite subfields:
{{{
sage: K = GF(5).algebraic_closure()
sage: z=K.gen(5) - K.gen(5) + K.gen(2)
sage: z.as_finite_field_element(minimal=True)
Traceback (most recent call last):
...
TypeError: unable to coerce
}}}
Note that it works fine when `minimal=False` (which is the default).
--
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Ticket URL: <http://trac.sagemath.org/ticket/16509#comment:3>
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