The poset of copies for automorphism groups of countable relational structures

Claude Laflamme, Maurice Pouzet, Norbert Sauer +1

Let $\mathrm{G}$ be a subgroup of the symmetric group $\mathfrak{S}(U)$ of all permutations of a countable set $U$. Let $\overline{\mathrm{G}}$ be the topological closure of $\mathr…