Sylow branching coefficients and a conjecture of Malle and Navarro
- Authors
- Publication Date
- Feb 05, 2021
- Source
- Apollo - University of Cambridge Repository
- Keywords
- Language
- English
- License
- Unknown
- External links
Abstract
Funder: Emmanuel College, Cambridge / We prove that a finite group $G$ has a normal Sylow $p$-subgroup $P$ if, and only if, every irreducible character of $G$ appearing in the permutation character $({\bf 1}_P)^G$ with multiplicity coprime to $p$ has degree coprime to $p$. This confirms a prediction by Malle and Navarro from 2012. Our proof of the above result depends on a reduction to simple groups and ultimately on a combinatorial analysis of the properties of Sylow branching coefficients for symmetric groups.
