Symmetries of modules of differential operators

Hichem Gargoubi, Pierre Mathonet, Valentin Ovsienko

Let $\mathcal{F}\_\lambda (S^1)$ be the space of tensor densities of degree (or weight) $\lambda$ on the circle $S^1$. The space ${\mathcal{D}}^k\_\lambda ,\mu (S^1)$ of $k$-th order linear differential operat…