#15855: Disable PARI algorithm for weierstrass_p in positive characteristic
-------------------------------------+-------------------------------------
Reporter: jdemeyer | Owner:
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-6.2
Component: elliptic curves | Resolution:
Keywords: | Merged in:
Authors: Jeroen Demeyer | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jdemeyer/ticket/15855 | 89726c59cdf83f3cee87e56806a3a86d8938df2c
Dependencies: | Stopgaps:
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Changes (by pbruin):
* status: positive_review => needs_info
Old description:
> Use the quadratic algorithm instead of PARI for precision close to but
> less than the characteristic. This is needed for #15767.
>
> Also fix the precision bound for the quadratic algorithm and clean up the
> code.
New description:
Use the quadratic algorithm instead of PARI for precision close to but
less than the characteristic. This is needed for #15767.
Also fix the precision bound for the quadratic algorithm and clean up the
code.
--
Comment:
I did some further cleaning up on a new branch
`u/pbruin/15855-weierstrass_p_cleanup`. The test for `p >= prec + 3` can
also be done at the beginning, since ''p'' really arise in the
denominators of the series, we are not just dividing by it as an
intermediate step of the algorithm. With this patch, we don't insist on
characteristic 0 when `algorithm='pari'`, but neither do we use PARI by
default. If you agree with the changes in this branch and it still good
as a dependency of #15767, you can put it in the branch field.
We probably have to check if everything still works after the latest PARI
fix, hence `needs_info`.
--
Ticket URL: <http://trac.sagemath.org/ticket/15855#comment:9>
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