#9417: Tamagawa number calculated incorrectly
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Reporter: arminstraub | Owner: cremona
Type: defect | Status: new
Priority: major | Milestone:
Component: elliptic curves | Keywords: tamagawa_number local_data
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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In 4.4.4 the following Tamagawa number gets evaluated as 2:
{{{
sage: K.<a> = NumberField(x^2+18*x+1)
sage: E = EllipticCurve(K, [0, -36, 0, 320, 0])
sage: E.tamagawa_number(K.ideal(2))
2
}}}
According to Magma this should be 4.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9417>
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