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arXiv · 1610.09422

Simultaneously preperiodic points for families of polynomials in normal form

Dragos Ghioca·Liang-Chung Hsia·Khoa Dang Nguyen
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Abstract

Let $d>m>1$ be integers, let $c_1,\dots, c_{m+1}$ be distinct complex numbers, and let $\mathbf{f}(z):=z^d+t_1z^{m-1}+t_2z^{m-2}+\cdots + t_{m-1}z+t_m$ be an $m$-parameter family of polynomials. We prove that the set of $m$-tuples of parameters $(t_1,\dots, t_m)\in\mathbb{C}^m$ with the property that each $c_i$ (for $i=1,\dots, m+1$) is preperiodic under the action of the corresponding polynomial $\mathbf{f}(z)$ is contained in finitely many hypersurfaces of the parameter space $\mathbb{A}^m$.

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Dragos Ghioca, Liang-Chung Hsia, Khoa Dang Nguyen. 2016-10-28. Simultaneously preperiodic points for families of polynomials in normal form. https://arxiv.org/abs/1610.09422

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