Suppose that there is a positive even integer n such that
Chapter 12, Problem 44E(choose chapter or problem)
Problem 44E
Suppose that there is a positive even integer n such that an = a for all elements a of some ring. Show that –a = a for all a in the ring.
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