#7096: bug in dual isogeny computation
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Reporter: cremona | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-4.1.3
Component: elliptic curves | Keywords: elliptic curve isogeny
Work_issues: | Author:
Reviewer: | Merged:
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Comment(by wuthrich):
While looking at the code of {{{{dual()}}}, I found a second bug in this
{{{
E = EllipticCurve(GF(7),[1,-1,1,-3,3])
phi = E.isogeny(E([1,0]))
phi.dual()
}}}
gives a ZeroDivisionError. Only separable isogenies are implented, so one
can not possibly take the dual of this separable isogeny of degree 7 in
chracteristic 7. A quick check should be introduced here.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7096#comment:2>
Sage <http://www.sagemath.org>
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