sentences:  Gelfand–Graev representation
  
  In representation theory, a branch of mathematics, the Gelfand–Graev representation is a representation of a reductive group over a finite field introduced by , induced from a non-degenerate character of a Sylow subgroup.The Gelfand–Graev representation is reducible and decomposes as the sum of irreducible representations, each of multiplicity at most 1.