#11229: Rational maps attached to elliptic curve isogeny are incorrect
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Reporter: johanbosman | Owner: cremona
Type: defect | Status: new
Priority: major | Milestone: sage-4.7
Component: elliptic curves | Keywords: elliptic curves, isogeny
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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{{{
sage: E = EllipticCurve([1,2,3,4,5])
sage: Eshort = E.short_weierstrass_model()
sage: phi = E.isogeny(E(0), Eshort)
sage: phiX, phiY = phi.rational_maps()
sage: phi(E(1,2))
(63 : 864 : 1)
sage: phiX(1,2), phiY(1,2)
(63, 7560)
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11229>
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