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arXiv 2006.01528math.DS
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割线法直接吸引域的拓扑性质

Topological properties of the immediate basins of attraction for the secant method

Laura Gardini, Antonio Garijo, Xavier Jarque

摘要:

研究了定义在$R^2$的一个子集上的离散动力系统,该子集由应用于实多项式$p$的割线法的迭代给出。$p$的每个简单实根$α$都与其吸引区域$\mathcal A(α)$相关联,该吸引域由向$S$的不动点$(α,α)$收敛的点集形成。我们用$\mathcal A^*(α)$表示它的直接吸引域,即包含$(α,α)$的$\mathcal A(α)$的连通分量。当$α$是$p$的内实根时,我们研究了$\mathcal A^*(α)$的一些拓扑性质.更准确地说,我们证明了$\partial \mathcal A^*(α)$中存在一个4-圈,并给出了$p$上保证$\mathcal A^*(α)$的简单连通性的条件。

英文摘要:

We study the discrete dynamical system defined on a subset of $R^2$ given by the iterates of the secant method applied to a real polynomial $p$. Each simple real root $α$ of $p$ has associated its basin of attraction $\mathcal A(α)$ formed by the set of points converging towards the fixed point $(α,α)$ of $S$. We denote by $\mathcal A^*(α)$ its immediate basin of attraction, that is, the connected component of $\mathcal A(α)$ which contains $(α,α)$. We focus on some topological properties of $\mathcal A^*(α)$, when $α$ is an internal real root of $p$. More precisely, we show the existence of a 4-cycle in $\partial \mathcal A^*(α)$ and we give conditions on $p$ to guarantee the simple connectivity of $\mathcal A^*(α)$.

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