Lei ℓ be an odd prime. Let K be a field of characteristic zero with algebraic closure Ka. Let n, in ≥ 4 be integers that are not divisible by ℓ Let f(x), h(x) ∈ K [x] be irreducible separable polynomials of degree n and m respectively. Suppose that the Galois group Gal(f) of f acts doubly transitively on the set Rf of roots of f and that Gal(/z) acts doubly transitively on Rh as well. Let J(C f,ℓ) and J(Ch, ℓ) be the Jacobians of the superelliptic curves Cf,ℓ: yℓ = f(x) and C h,ℓ: yℓ = h(x) respectively. We prove that J(Cf,ℓ) and J(Chℓ) are not isogenous over K a if the splitting fields of / and h are linearly disjoint over K and K contains a primitive ℓth root of unity.
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