Rips Induction: Index of the dual lamination of an $\mathbb{R}$-tree

Thierry Coulbois, Arnaud Hilion

Let $T$ be a $\mathbb{R}$-tree in the boundary of the Outer Space CV${}_N$, with dense orbits. The $Q$-index of $T$ is defined by means of the dual lamination of $T$. It is a generalisation…