#20086: rational powers in ZZ[X] and QQ[X]
-------------------------------------+-------------------------------------
Reporter: cheuberg | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-7.1
Component: basic arithmetic | Resolution:
Keywords: | Merged in:
Authors: Clemens | Reviewers: Benjamin Hackl
Heuberger, Vincent Delecroix | Work issues:
Report Upstream: N/A | Commit:
Branch: | 6bf385b18875572eeb4ab748eb8f25124bce6acf
u/behackl/polynomial/rational- | Stopgaps:
powers |
Dependencies: |
-------------------------------------+-------------------------------------
Comment (by vdelecroix):
With
{{{
if u.parent() != u.base_ring():
u = u.base_ring(u)
try:
ans = u.nth_root(n)
except AttributeError:
raise NotImplementedError(...)
}}}
You have a risk of infinite recursion. You should use `nth_root` of `u`
only if `u.parent()` is not `self.parent()` anymore.
--
Ticket URL: <http://trac.sagemath.org/ticket/20086#comment:47>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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