#9322: bug in simon_two_descent for elliptic curves
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Reporter: cremona | Owner: AlexGhitza
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.7.2
Component: elliptic curves | Keywords: Simon
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by zimmerma):
I've been struggling with that bug for a few hours, and have made only
little progress.
With Sage 4.7.1 and Pari 2.4.3 (development), I've noticed that Pari 2.4.3
and the version of Pari within Sage differ at {{{bbnf =
bnfinit(rnfeq[1],1)}}} in {{{ell.gp}}}, where
{{{rnfep[1] = x^6 + 625*x^5 + 135916*x^4 + 14984560*x^3 + 914453072*x^2 +
29502178560*x + 392635160576}}}.
Pari 2.4.3 returns {{{bbnf: [Mat(2), Mat([0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0,
...}}} whereas
Pari within Sage returns {{{bbnf: [Mat(2), Mat([0, 0, 0, 1, 1, 1, 1, 1, 1,
1, 1, ...}}}
However I don't know if {{{bnfinit}}} should be deterministic...
Paul
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9322#comment:5>
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