A slight modification of the example which documents the use of the method
`rational_parameterization' yields a rather long Traceback:
A.<x,y> = AffineSpace(QQ, 2)
C = Curve([10*x^2 + 2*y^2 - 3], A)
C.rational_parameterization()
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-1-ad1efb038e7e> in <module>()
1 A = AffineSpace(QQ, Integer(2), names=('x', 'y',)); (x, y,) =
A._first_ngens(2)
2 C = Curve([Integer(10)*x**Integer(2) + Integer(2)*y**Integer(2) -
Integer(3)], A)
----> 3 C.rational_parameterization()
SNIPPED MANY LINES
/home/sc_serv/sage/local/lib/python2.7/site-packages/sage/schemes/generic/morphism.pyc
in __init__(self, parent, polys, check)
927 target = parent._codomain.ambient_space()
928 if len(polys) != target.ngens():
--> 929 raise ValueError("there must be %s
polynomials"%target.ngens())
930 try:
931 polys = [source_ring(poly) for poly in polys]
ValueError: there must be 3 polynomials
-- Peter Müller (Würzburg)
P.S.: This happens for SageMath version 8,7 on Manjaro-Linux and at
https://sagecell.sagemath.org/ too.
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