#19946: Asymptotic Ring: cannot construct 2^n when coefficient ring is SR
-------------------------------------+----------------------------
Reporter: cheuberg | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.1
Component: asymptotic expansions | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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The following is unexpected:
{{{
sage: A.<n> = AsymptoticRing('QQ^n * n^QQ', SR)
sage: 2^n
Traceback (most recent call last):
...
ArithmeticError: Cannot construct 2^n in Growth Group QQ^n * n^QQ
> *previous* TypeError: unsupported operand parent(s) for '*':
'Growth Group QQ^n * n^QQ' and 'Growth Group SR^n'
}}}
The only work-around I found until now is
{{{
sage: A(AsymptoticRing(growth_group='QQ^n', coefficient_ring=ZZ)('2^n'))
2^n
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/19946>
Sage <http://www.sagemath.org>
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