I think this is a bug: sage: Kt.<x,y,z,t>=QQ[] sage: J=[x*y*z-t^2,x+2*y+3*z-t-1] sage: Ideal(J).dimension() 2 sage: C=Curve(J);C Affine Curve over Rational Field defined by x*y*z - t^2, x + 2*y + 3*z - t - 1 sage: C.genus() 1 sage:
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