%0 Journal Article %A Alexander Thomas %T Infinitesimal Modular Group: $q$-Deformed $\mathfrak{sl}_2$ and Witt Algebra %J Symmetry, integrability and geometry: methods and applications %D 2024 %V 20 %U http://geodesic.mathdoc.fr/item/SIGMA_2024_20_a52/ %G en %F SIGMA_2024_20_a52