Let $T^2$ be a 2-torus and $f:T^2\rightarrow T^2$ a smoophsmooth map. Let $f_*:\pi_1(T^2)\rightarrow\pi_1(T^2)$ be the iducendinduced map inon the fudamentalfundamental group $\pi_1$. If $f_*$ has no eigenvalue greater than 1, then all ballballs of T ^ 2 has$T^2$ have subexponential growth by $ f $. Why?
Post Closed as "Not suitable for this site" by Chris Gerig, Stefan Kohl♦, Anthony Quas, Igor Belegradek, Fernando Muro