A quantitative estimate for quasi-integral points in orbits
Abstract
Let f(z) be a rational function of degree at least 2 with coefficients in a number field K, and assume that the second iterate f2(z) of f(z) is not a polynomial. The second author previously proved that for any b in K, the forward orbit Of(b) contains only finitely many quasi-S-integral points. In this note we give an explicit upper bound for the number of such points.
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