Tame semicascades and cascades generated by affine self-mappings of the $d$-torus

Abstract

We give a complete characterization of the affine self-mappings $\varphi$ of the torus $\mathbb T^d$ that generate K\"ohler-tame semicascades and cascades. Namely, we show that the semicascade generated by $\varphi$ is tame if and only if the matrix $A$ of $\varphi$ satisfies $A^p=A^q$, where $p$ and $q$ are some nonnegative integers, $p\neq q$. For cascades the corresponding condition has the form $A^m=I$, where $m$ is some positive integer and $I$ is the identity matrix.