#10888: problem in evaluation dual isogeny
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Reporter: wuthrich | Owner: cremona
Type: defect | Status: new
Priority: major | Milestone:
Component: elliptic curves | Keywords: isogenies,
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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The following bug was reported by J. Gillibert.
{{{
sage: K.<th> = NumberField(x^2+3)
sage: E = EllipticCurve(K,[7,0])
sage: phi = E.isogeny(E(0,0))
sage: P = E(-3,4*th)
sage: phi(P)
(-16/3 : 8/9*th : 1)
sage: Q = phi(P)
sage: phihat = phi.dual()
sage: phihat(Q)
}}}
This gives back a
{{{
TypeError: <type
'sage.rings.polynomial.multi_polynomial_libsingular.MPolynomial_libsingular'>
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10888>
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