2025/02/28 by Darné, Jaques, Enomoto, Naoya, Satoh, Takao
#Algebraic Topology (math.AT) #FOS: Mathematics #Group Theory (math.GR)
paper · doi:10.48550/arxiv.2502.20652
In this short paper, we show that the McCool group does not satisfy the Andreadakis equality from degree 7, and we give a lower bound for the size of the difference between the two relevant filtrations. As a consequence, we see that the Andreadakis problem for the McCool group does not stabilize.