#11270: Implement David Zywina's new fast algorithm for determining
surjectivity of
Galois representations attached to elliptic curves
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Reporter: was | Owner: cremona
Type: enhancement | Status: new
Priority: minor | Milestone: sage-6.1
Component: elliptic curves | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by wuthrich):
I tried to do this, but I ran into an inconsistency. I copied the first
code of Zywina taken from
http://www.mast.queensu.ca/~zywina/papers/code/EffectiveModl.py
where for small primes, he uses explicit polynomials as criterions for
non-surjectivity. When I did so, there were doctest failures that show
that his program does not give the same answer as our sage implementation.
I have checked in details these three cases and I found that our result is
correct and his wrong. I contact him about this.
So until further notice, this is a ticket that we should NOT do.
--
Ticket URL: <http://trac.sagemath.org/ticket/11270#comment:2>
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