A. Martino

collaborators

2 papers

math.GR2024

Centralisers of linear growth automorphisms of free groups

Naomi Andrew, Armando Martino

In this note we investigate the centraliser of a linearly growing element of $Out (F_{n})$ (that is, a root of a Dehn twist automorphism), and show that it has a finite index…

math.GR2024

On the action of relatively irreducible automorphisms on their train tracks

Stefano Francaviglia, Armando Martino, Dionysios Syrigos

Let $G$ be a group and let $G$ be a free factor system of $G$ , namely a free splitting of $G$ as $G = G_{1} * \dots * G_{k} * F_{r}$ . In this paper, we study the set of train track po…