“…Indeed it is easy to see that (X, Y ) = (t g+1 (x), 1) satisfies this equation. (Note also that, by [3], this solution is primitive, namely, all the solutions are obtained from this by the multiplication rule in [3].) Moreover, as it is well-known, all the zeros of t n (x) are real and belong to the closed interval [−2, 2].…”