Subgroup Decomposition in $mathrm {Out}(F_n)$

Develops a decomposition theory for subgroups of $mathsf{Out}(F_n)$ which generalizes the decomposition theory for individual elements of $mathsf{Out}(F_n)$ found in the work of Bestvina, Feighn, and Handel, and which is analogous to the decomposition theory for subgroups of mapping class groups found in the work of Ivanov.