#20086: rational powers in ZZ[X] and QQ[X]
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Reporter: cheuberg | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-7.2
Component: basic arithmetic | Resolution:
Keywords: | Merged in:
Authors: Clemens | Reviewers: Benjamin Hackl
Heuberger, Vincent Delecroix | Work issues:
Report Upstream: N/A | Commit:
Branch: public/20086 | 6f91df97a81fa094c04583314ad38cd5fd199cdb
Dependencies: | Stopgaps:
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Comment (by behackl):
Replying to [comment:53 vdelecroix]:
> Would be nice to have a non polynomial examples. But currently, order in
number fields does not know whether they are principal ideal domain or
unique factorization domain
> {{{
> sage: R = ZZ[I]
> sage: R in PrincipalIdealDomains()
> False
> sage: R in UniqueFactorizationDomains()
> False
> }}}
>
Yes, the gaussian integers were also my first idea for such an example,
but getting this to work should rather be a follow-up ticket.
> In `__pow__` for integer polynomials, in the case the exponent is an
integer you should only use `nn` and not `exp` (i.e. you should replace
`if exp == 0` and `if exp < 0` by `if nn == 0` and `nn < 0`).
Makes sense. Done.
--
Ticket URL: <http://trac.sagemath.org/ticket/20086#comment:55>
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