On Nichols algebras over PGL(2,q) and PSL(2,q)

S. Freyre, M. Graña, L. Vendramin

We compute necessary conditions on Yetter-Drinfeld modules over the groups $\mathbf{PGL}(2,q)=\mathbf{PGL}(2,\FF_q)$ and $\mathbf{PSL}(2,q)=\mathbf{PSL}(2,\FF_q)$ to generate finit…