Character covering number of ${\mathrm{PSL}}_2(q)$

Namrata Arvind, Saikat Panja

For a group $G$ and a character $\chi$ of $G$, let $c(\chi )$ denote the set of all irreducible characters of $G$, occurring in $\chi$. We prove that whenever $q\ge 8$, all non-trivial irre…