A rigid local system with monodromy group the big Conway group 2.Co_1 and two others with monodromy group the Suzuki group 6.Suz

Nicholas M. Katz, Antonio Rojas-León, Pham Huu Tiep

In the first three sections, we develop some basic facts about hypergeometric sheaves on the multiplicative group ${\mathbb{G}}_m$ in characteristic $p>0$. In the fourth and fifth…