#8972: Inversion and fraction fields for power series rings
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Reporter: SimonKing | Owner: AlexGhitza
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.4.4
Component: algebra | Resolution: fixed
Keywords: power series ring, fraction field | Author: Simon King
Upstream: N/A | Reviewer: Robert
Bradshaw
Merged: | Work_issues: trouble with
schemes/elliptic_curves
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Comment(by SimonKing):
In most cases, the problems seem to come from using {{{f/g}}} on power
series in situations where {{{g}}} is of valuation zero. This used to
return a power series, which I consider the wrong answer (it should be a
Laurent series). Now, if one wants {{{f/g}}} as a power series, one should
use {{{f * ~g}}} instead.
I am now confident that I'll soon be able to submit another patch that
resolves it.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8972#comment:29>
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