$SL(2,\mathbb{Z})$, les tresses à trois brins, le tore modulaire et $Au{t}^{+}(F_2)$

Alexis Marin

The action of $SL(2,\mathbf{Z})$ on the integer torus and its quotient by central symmetry and Artin's presentation of three strings braid group $B_3$, produces a presentation with…