$\R$-trees, dual laminations, and compact systems of partial isometries

Details $\R$-trees, dual laminations, and compact systems of partial isometries $\R$-trees, dual laminations, and compact systems of partial isometries

2007-12-18

arxiv.org/abs/0712.2946v3

Math. Proc. of the Cambridge Phil. Soc. 147, 2 (2009) 345-368

Mathematics

Group Theory

minor update

Scientific paper

Let $\FN$ be a free group of finite rank $N \geq 2$, and let $T$ be an $\R$-tree with a very small, minimal action of $\FN$ with dense orbits. For any basis $\CA$ of $\FN$ there exists a {\em heart} $K_{\CA} \subset \bar T$ (= the metric completion of $T$) which is a compact subtree that has the property that the dynamical system of partial isometries $a_{i} : K_{\CA} \cap a_{i} K_{\CA} \to a_{i}\inv K_{\CA} \cap K_{\CA}$, for each $a_{i} \in \CA$, defines a tree $T_{(K_{\CA}, \CA)}$ which contains an isometric copy of $T$ as minimal subtree.

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