Year: 2026
Type: preprint
Abstract: For $n\ge2$, let $F_n$ be the free group of rank $n$, and let $\IA(F_n)$ be the group of automorphisms of $F_n$ acting trivially on its abelianization. Two natural filtrations of $\IA(F_n)$ are its lower central series $γ_c(\IA(F_n))$ and the Andreadakis filtration $\mathrm{I}_{c+1}\mathrm{A}(F_n)$, consisting of automorphisms acting trivially on $F_n/γ_{c+1}(F_n)$, $c \geq 1$. Andreadakis conjectured that these filtrations coincide. We prove that the conjectured equality fails for all $n\ge3$ and $c\ge4$.
Source: arXiv (Cornell University)
Author: Kofinas, C. E.
Institution: University of the Aegean
Language: English
Subfield: Geometry and Topology
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7224084742