CurveResidue

b = Surface(u^(2) - u, u^(2) + u, v, u, -10, 10, v, -10, 10)
a = CurveCartesian(u^(2) - u, u^(2) + u, u^(3) - u, u, -10, 10)
d = Surface(v, u^(2) + u, u^(3) - u, u, -10, 10, v, -10, 10)
c = Surface(u^(2) - u, v, u^(3) - u, u, -10, 10, v, -10, 10)