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arXiv 1810.02269math.NT
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二次多项式集的有限轨道点

Finite orbit points for sets of quadratic polynomials

Wade Hindes

摘要:

设$S=\{x^2+c_1, x^2+c_2,\dots, x^2+c_s\}$是一组有理系数的二次多项式,$P$是一个有理基点。我们对$(S,P)$进行分类,其中$P$对$S$具有有限轨道,假设每个多项式的最大周期长度至多为3(由Poonen提出)。特别地,在这些假设下,我们证明了,如果$s\geq4$,那么有没有点$P$有限轨道的$S$。此外,我们使用这个角度来制定一个类似的莫顿-西尔弗曼猜想的有理函数集。

英文摘要:

Let $S=\{x^2+c_1, x^2+c_2,\dots, x^2+c_s\}$ be a set of quadratic polynomials with rational coefficients, and let $P$ be a rational basepoint. We classify the pairs $(S,P)$ for which $P$ has finite orbit for $S$, assuming that the maximum period length for each individual polynomial is at most three (conjectured by Poonen). In particular, under these hypotheses we prove that if $s\geq4$, then there are no points $P$ with finite orbit for $S$. Moreover, we use this perspective to formulate an analog of the Morton-Silverman Conjecture for sets of rational functions.

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