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Published online by Cambridge University Press: 19 August 2015
We explore transversals of finite index subgroups of finitely generated groups. We show that when $H$ is a subgroup of a rank-
$n$ group
$G$ and
$H$ has index at least
$n$ in
$G$, we can construct a left transversal for
$H$ which contains a generating set of size
$n$ for
$G$; this construction is algorithmic when
$G$ is finitely presented. We also show that, in the case where
$G$ has rank
$n\leq 3$, there is a simultaneous left–right transversal for
$H$ which contains a generating set of size
$n$ for
$G$. We finish by showing that if
$H$ is a subgroup of a rank-
$n$ group
$G$ with index less than
$3\cdot 2^{n-1}$, and
$H$ contains no primitive elements of
$G$, then
$H$ is normal in
$G$ and
$G/H\cong C_{2}^{n}$.