The essential dimension of the normalizer of a maximal torus in the   projective linear group
  Let p be a prime, k be a field of characteristic different from p containing a primitive p-th root of unity and N be the normalizer of the maximal torus in the projective linear group PGLn. We compute the exact value of the essential dimension ed(N;p) of N at p for every n. 
Aurel Meyer and Zinovy Reichstein