#7576: improvements to the prove_BSD function
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Reporter: rlm | Owner: cremona
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-4.3.1
Component: elliptic curves | Keywords:
Work_issues: | Author: Robert Miller
Upstream: N/A | Reviewer:
Merged: |
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Comment(by was):
Copying from Facebook again:
{{{
Jamie Weigandt
I read that Robert has implemented a fast 2-isogeny descent. Can this
compute the honest 2-Selmer group of a given elliptic curve?
I thought these bugs might be arising from the fact that mwrank does not
always do this.
With 438e, it erroneously computes the rank bound to be 1, while it should
be 0.
With 960d the optimal curve has sha of order 4 while sha is trivial for an
isogenous
curve, so mwrank returns a rank bound of 0.
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7576#comment:9>
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