2 papers
math.GT2025
The Johnson-Morita theory for the handlebody group
Kazuo Habiro, Gwenael Massuyeau
The Johnson-Morita theory is an algebraic approach to the mapping class group of a surface, in which one considers its action on the successive nilpotent quotients of the fundament…
math.GT2025
On the degree-two part of the associated graded of the lower central series of the Torelli group
Quentin Faes, Gwenael Massuyeau, Masatoshi Sato
We consider the associated graded of the lower central series $\mathcal{I} = Î_1 \mathcal{I} \supset Î_2 \mathcal{I…