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Rational values of transcendental functions and arithmetic dynamics (1808.07676v2)

Published 23 Aug 2018 in math.NT and math.DS

Abstract: We count algebraic points of bounded height and degree on the graphs of certain functions analytic on the unit disk, obtaining a bound which is polynomial in the degree and in the logarithm of the multiplicative height. We combine this work with p-adic methods to obtain a lower bound of the form $cD{n/4 - \varepsilon}$ on the degree of the splitting field of $P{\circ n}(z)=P{\circ n}(\alpha)$, where $P$ is a polynomial of degree $D\geq 2$ over a number field, $P{\circ n}$ is its $n$-th iterate and $c$ depends effectively on $P, \alpha$ and $\varepsilon$. Our $c$ is positive for each algebraic $\alpha$ for which the set ${P{\circ n}(\alpha):n\in\mathbb{N}}$ is infinite.

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