On groups of central type, non-degenerate and bijective cohomology classes

Nir Ben David, Yuval Ginosar

A finite group $G$ is of central type (in the non-classical sense) if it admits a non-degenerate cohomology class $[c]\in H^2(G,\C^*)$ ($G$ acts trivially on $\C^*$). Groups of cen…