Mandelbrot set for fractal $n$-gons and zeros of power series

Abstract

We give a framework to study the connectedness of the set of zeros of power series with coefficients in a finite subset $G\subset \mathbb{C}$. We prove that the set of zeros in the unit disk is connected and locally connected if some graph on the set $G$ of coefficients is connected. Furthermore, we apply this result to the study of the Mandelbrot set ${\mathcal{M}}_n$ for fractal $n$-gons. We prove that ${\mathcal{M}}_n$ is connected and locally connected for any $n$.

arXiv comment9 pages. Former title:${\mathcal{M}}_n$ is connected