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Linear dynamics of an operator associated to the Collatz map (2303.03203v1)

Published 6 Mar 2023 in math.FA

Abstract: In this paper, we study the dynamics of an operator $\mathcal T$ naturally associated to the so-called Collatz map, which maps an integer $n \geq 0$ to $n / 2$ if $n$ is even and $3n + 1$ if $n$ is odd. This operator $\mathcal T$ is defined on certain weighted Bergman spaces $\mathcal B ^ 2 _ \omega$ of analytic functions on the unit disk. Building on previous work of Neklyudov, we show that $\mathcal T$ is hypercyclic on $\mathcal B ^ 2 _ \omega$, independently of whether the Collatz Conjecture holds true or not. Under some assumptions on the weight $\omega$, we show that $\mathcal T$ is actually ergodic with respect to a Gaussian measure with full support, and thus frequently hypercyclic and chaotic.

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