#8972: Inversion and fraction fields for power series rings
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Reporter: SimonKing | Owner: AlexGhitza
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.4.2
Component: algebra | Keywords: power series ring, fraction field
Author: Simon King | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by SimonKing):
Replying to [comment:11 SimonKing]:
> I forgot one remark:
>
> I don't know how this happens, but the ``truncate`` method of Laurent
series behaves different than before, although the ``truncate`` method of
power series did not change:
Outch, now I see my mistake.
* The documentation of ``LaurentSeries.truncate`` states that indeed it
returns a Laurent series. It does not have a doc test, so, I will add one.
* The old doc test of ``PowerSeries.truncate`` fails with my patch. The
reason is that the ''power'' series constructed in this doc test is now in
fact a ''Laurent'' series; this is what made me believe that the behaviour
of the method has changed. So, I only have to change the doc test.
But before submitting a patch to add/correct these doc tests, I'll wait
for input of a referee.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8972#comment:12>
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