  Let $\mathcal{E}$ be the set of endomorphisms of the $n$-torus. We exhibit an
example of a map such that is robustly transitive if $\mathcal{E}$ is endowed
with the $C^2$ topology but is not robustly transitive if $\mathcal{E}$ is
endowed with the $C^1$ topology.

Dynamical Systems