Quotient groups of IA-automorphisms of a free group of rank 3
Quotient groups of IA-automorphisms of a free group of rank 3
We prove that, for any positive integer [Formula: see text], the quotient group [Formula: see text] of the lower central series of the McCool group [Formula: see text] is isomorphic to two copies of the quotient group [Formula: see text] of the lower central series of a free group [Formula: …