Rx.<x> = PolynomialRing(GF(5))
C = superelliptic(x^3 + 1, 2)
Rxy.<x, y> = PolynomialRing(GF(5), 2)
f1 = superelliptic_function(C, x*y)
CAS = as_cover(C, [f1])
g = CAS.uniformizer()
AA = g