#7935: local_data for elliptic curves over number fields
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Reporter: wuthrich | Owner: cremona
Type: defect | Status: new
Priority: major | Milestone: sage-4.3.1
Component: elliptic curves | Keywords: elliptic curve, number fields,
local data, tamagawa
Work_issues: | Author:
Upstream: N/A | Reviewer:
Merged: |
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Comment(by wuthrich):
I am not sure whether it is a good idea to have a definition of
tamagawa_product for number fields that differs from the one for Q; but it
is the only sensible definition. An option whould be to change the
definition over Q; it would affect only non-minimal equation, but still it
might break a lot of compatibility.
The very last thing in the patch, line 1024 in the new
ell_number_field.py, is strange. It yields now a different global minimal
model (yes they differ by a weierstrass-change with u a unit in K). If one
computes this outside of this file one gets the old result. This may be
linked to #7930, I don't know.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7935#comment:3>
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