#8685: evaluation of Monsky-Washnitzer objects
-----------------------------+----------------------------------------------
Reporter: jen | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-4.4
Component: number theory | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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The following should raise an error since f0 has a singularity at P (and
isn't necessarily 0 at all finite Weierstrass points):
{{{
sage: R.<x> = QQ['x']
sage: H= HyperellipticCurve(x^3-10*x+9)
sage: K = Qp(5,10)
sage: HK = H.change_ring(K)
sage: P = HK(1,0)
sage: import sage.schemes.elliptic_curves.monsky_washnitzer as mw
sage: Mfrob,forms=mw.matrix_of_frobenius_hyperelliptic(HK)
sage: f0 = forms[0]
sage: f0(P[0],P[1])
0
sage: f0(x,K(0))
0
}}}
In fact, Sage seems to knows this...just not when the y-coordinate is 0 in
the p-adic field. So, a coercion error?
{{{
sage: f0(x,0)
---------------------------------------------------------------------------
ZeroDivisionError Traceback (most recent call
last)
ZeroDivisionError: Rational division by zero
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8685>
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