#12080: manin constant
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Reporter: wuthrich | Owner: cremona
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.0
Component: elliptic curves | Resolution:
Keywords: manin constant, isogeny | Work issues:
Report Upstream: N/A | Reviewers:
Authors: wuthrich | Merged in:
Dependencies: | Stopgaps: todo
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Comment (by was):
Replying to [comment:4 wuthrich]:
> magma, by the way, gets the correct answer (meaning the one consistent
with my definition above).
I finally wrote the obvious program that one should write when ref'ing
this patch:
{{{
wstein@boxen:/tmp/wstein/sage-5.0.b9$ more 12080.sage
for E in cremona_curves([1..10000]):
N = E.conductor()
if N%100==0: print N
c = E.manin_constant()
d = magma(E).ManinConstant()
if c != d:
print E.cremona_label(), c, d
}}}
When running it up to 300, I get two differences from Magma:
{{{
27a4 3 1
80b4 2 1
nothing else up to 300
}}}
It could very well be that Magma is wrong... but as part of this patch,
could somebody get to the bottom of this?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12080#comment:13>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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