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Transcendence of values of the iterated exponential function at algebraic points
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math.NT
keywords
algebraicnumberfunctionordervarphiapproximatedconvergesdenotes
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abstract
We say that the order of an algebraic number $A$ is the minimum of positive integers $k$ such that $A^k$ is rational. In this paper, we show that the number of algebraic numbers $A$ with order $k$ such that \[ A,\ A^A,\ A^{A^A},\ \ldots \] converges to an algebraic number is approximated by $(e-1/e)\varphi (k)$. Here $\varphi(k)$ denotes Euler's totient function.
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