#2508: Problem converting a Laurent Series from pari to Sage
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Reporter: cremona | Owner: jdemeyer
Type: defect | Status: new
Priority: major | Milestone: sage-4.6
Component: interfaces | Keywords: Laurent series, pari
Author: Jeroen Demeyer | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by jdemeyer):
Note also that the answer wrongly gets more terms:
{{{
sage: E = EllipticCurve('11a1')
sage: R = LaurentSeriesRing(RationalField(),'q')
sage: XY = E.pari_mincurve().elltaniyama()
sage: XY[0]
x^-2 + 2*x^-1 + 4 + 5*x + 8*x^2 + x^3 + 7*x^4 - 11*x^5 + 10*x^6 - 12*x^7 -
18*x^8 - 22*x^9 + 26*x^10 - 11*x^11 + 41*x^12 + 44*x^13 - 15*x^14 +
O(x^15)
sage: E.modular_parametrization().power_series()[0]
q^-2 + 2*q^-1 + 4 + 5*q + 8*q^2 + q^3 + 7*q^4 - 11*q^5 + 10*q^6 - 12*q^7 -
18*q^8 - 22*q^9 + 26*q^10 - 11*q^11 + 41*q^12 + 44*q^13 - 15*q^14 +
19746*q^15 + 51565*q^16 + 150132*q^17 + O(q^18)
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/2508#comment:6>
Sage <http://www.sagemath.org>
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