#7644: generic power series reversion
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Reporter: was | Owner: AlexGhitza
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.6.1
Component: algebra | Keywords: lagrange, reversion
Author: Niles Johnson | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by fwclarke):
This is looking good. Some comments on the docstring:
{{{
If f has infinite precision, then the precision
of the reversion defaults to the default precision of
``f.parent()``.
}}}
should say "unless precision is set", or words to that effect.
The remark a few lines later that
{{{
self must have finite precision (i.e. this cannot be done
for polynomials).
}}}
is no longer appropriate. Nor is
{{{
Under the current implementation, the leading
coefficient must be a unit in the base ring, and the base ring must
have characteristic zero.
}}}
I'm not sure that
{{{
In positive characteristic, attempt first to lift to characteristic
zero and perform the reversion there:
}}}
is in the right place; it's really to do with the algorithm. Perhaps
better to say here that the function can handle some base rings of non-
zero characteristic.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7644#comment:16>
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