#19945: Asymptotic Ring: cannot construct (1/2)^n
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Reporter: cheuberg | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.1
Component: asymptotic expansions | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by dkrenn):
Replying to [ticket:19945 cheuberg]:
> {{{
> sage: A.<n> = AsymptoticRing('QQ^n * n^QQ', ZZ)
> sage: (1/2)^n
> }}}
The problem is that `(1/2)^n` calls `__pow__` of the rational `1/2`. This
tries `A(1/2)^n`, which fails since `1/2` is not in `A`. This also
explains why it works with coefficient ring `QQ` as in [comment:1
comment:1].
As a workaround you can use
{{{
sage: n.rpow(1/2)
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/19945#comment:2>
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