2 problems

Let $F_n$ be the free group of rank $n$, and let $E\Pi A(F_n)$ denote the group of elementary palindromic automorphisms of $F_n$. Collins's torsion-freeness conjecture. The group…

Let ${\rm N}_{n,3}$ be the free nilpotent group of rank $n$ and class $3$, and let $\mu_{ij}$ denote the elementary palindromic automorphism that sends $x_i$ to $x_jx_ix_j$ and fix…