Semiflows deforming automorphisms groups

Abstract

In this short note, we prove that, for any pair of finite groups $G$ and $H$, there exist a finite $T_0$-space $X$ and a semiflow $\phi :[0,\infty )\times X\to X$ such that $\mathrm{Aut}(X)\cong G$, whereas $\mathrm{Aut}({\phi }_t(X))\cong H$ for every $t>0$. Thus, the symmetry group of a finite $T_0$-space and those of all its positive-time images can be prescribed independently.