Given a free group of rank $n$ -> $F_n$ .
Is it easy to see what is the index of the subgroup $ [F_n, F_n ] \subseteq F_n $ ?
Hope someone will be able to help me understand this
Thanks !
Given a free group of rank $n$ -> $F_n$ .
Is it easy to see what is the index of the subgroup $ [F_n, F_n ] \subseteq F_n $ ?
Hope someone will be able to help me understand this
Thanks !