No problem with Singular 4.3.2 included in sage (on mac).
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Thanks. It looks like the error occurs in integralbasis.lib. It's last
version data is fairly recent, so the file may be under active maintenance.
sagemath has grown enough divisor machinery that it can probably compute a
conic model of a genus 0 curve, which would be more standard to try and
p
The following code raises a SingularError in SageMath version 10.4.beta3
(with system singular enabled), and the same at
https://sagecell.sagemath.org/ :
R. = QQ[]
f = -2*x^2*y^2 - x^3 - x^2*y + x*y^2 + y^3 + 2*x^2 + 2*y^2 - 2
C = Curve(f)
assert C.genus() == 0
print(C.rational_parameterization(
