A short proof of Handel and Mosher's alternative for subgroups of   $\text{Out}(F_N)$
  We give a short proof of a theorem of Handel and Mosher stating that any finitely generated subgroup of $\text{Out}(F_N)$ either contains a fully irreducible automorphism, or virtually fixes the conjugacy class of a proper free factor of $F_N$, and we extend their result to non finitely generated subgroups of $\text{Out}(F_N)$. 
Camille Horbez
math.GR math.GT