I was reading few topics related to p groups and pro p groups. Then I came across the term "two step centraliser". I could not find the definition of this in google search.
It will be very helpful for me if someone give me some idea and related links for the definition. I will be grateful. Thnx in advance.
I am sorry for this kind of simple question, perhaps I missed something. I am really sorry. Please help me. Thanks again.