A stabilizer interpretation of the Grothendieck-Teichmüller group ${\mathsf{GRT}}_1(\mathbf{k})$

Benjamin Enriquez, Hidekazu Furusho

If $\mathfrak{u}$ and $\mathfrak{v}$ are Lie algebras, then the product $\mathrm{Out}(\mathfrak{u})\times \mathrm{Out}(\mathfrak{v})$ of their outer automorphism groups naturally acts…