A note on Dehn colorings and invariant factors

Derek A. Smith, Lorenzo Traldi, William Watkins

If $A$ is an abelian group and $\varphi$ is an integer, let $A(\varphi )$ be the subgroup of $A$ consisting of elements $a\in A$ such that $\varphi \cdot a=0$. We prove that if $D$ is a diagram of a…