#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):
I think the problem boils down to two problems:
1. Laurent series have no attribute ``exp``, unlike power series.
2. In some situations, there still occurs a formal fraction field when it
should be a Laurent series ring. The result is an attribute error.
For the first situation, I suggest to implement ``exp`` for Laurent series
of non-negative valuation (using exp of the underlying power series). For
the second situation, I have to analyse what goes wrong.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8972#comment:26>
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