Iterated Monodromy Groups

Details Iterated Monodromy Groups Iterated Monodromy Groups

2003-12-16

arxiv.org/abs/math/0312306v1

Mathematics

Dynamical Systems

about 40 pages, 6 figures

Scientific paper

We associate a group $IMG(f)$ to every covering $f$ of a topological space $M$ by its open subset. It is the quotient of the fundamental group $\pi_1(M)$ by the intersection of the kernels of its monodromy action for the iterates $f^n$. Every iterated monodromy group comes together with a naturally defined action on a rooted tree. We present an effective method to compute this action and show how the dynamics of $f$ is related to the group. In particular, the Julia set of $f$ can be reconstructed from $\img(f)$ (from its action on the tree), if $f$ is expanding.

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