If H is a Sylow p-subgroup of a group, prove that N(N(H))
Chapter 24, Problem 50E(choose chapter or problem)
If H is a Sylow p-subgroup of a group, prove that N(N(H)) = N(H).
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer