sage: Kz.<x,y,z>=QQ[]
sage: C=Curve([x+y+z+1,x*(x-1)*(x+1)+y*(y-1)*(y+1)])
sage: C.genus()

    253     return self._genus
    254 except AttributeError:
--> 255     raise NotImplementedError

NotImplementedError:


sage: C.irreducible_components()
[
Closed subscheme of Affine Space of dimension 3 over Rational Field defined by:
  z + 1,
  x + y,
Closed subscheme of Affine Space of dimension 3 over Rational Field defined by:
  x + y + z + 1,
  3*y^2 + 3*y*z + z^2 + 3*y + 2*z
]

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