#20086: ZZ[X], QQ[X]: allow arbitrary powers of constant polynomials
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Reporter: cheuberg | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-7.1
Component: basic arithmetic | Resolution:
Keywords: | Merged in:
Authors: Clemens Heuberger | Reviewers: Benjamin Hackl
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/cheuberg/polynomials/power | 892109ac4f48a4a32d35671365ecceb0d1c9e0bf
Dependencies: | Stopgaps:
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Comment (by vdelecroix):
Replying to [comment:24 cheuberg]:
> >
> > [... snip ...]
> >
> There was a discussion on sage-devel a few weeks ago. Every parent seems
to have its own home-made logic about how to do coercion. Please do not
try to fix that in this ticket.
Please do not try to complicate it in this ticket either. A possible
solution could be:
- allow `polynomial^rational` as much as we can (i.e. for some constant
polynomials for the sake of this ticket). For more general polynomial we
can for now raise a `NotImplementedError`.
- disallow `polynomial^polynomial` even if the power is a constant
polynomial. In that case, the error should be a `TypeError`. This is the
current behavior for some polynomial rings but not all
{{{
sage: ZZ['x'].gen() ** ZZ['x'].one()
-> TypeError
sage: QQ['x'].gen() ** ZZ['x'].one()
-> TypeError
sage: RR['x'].gen() ** ZZ['x'].one()
x
}}}
What do you think? Would that solution fit your needs?
Vincent
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Ticket URL: <http://trac.sagemath.org/ticket/20086#comment:25>
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