Prove that a group G is Abelian if and only if (ab)–1 =
Chapter 2, Problem 25E(choose chapter or problem)
Prove that a group G is Abelian if and only if (ab)–1 = a–1b–1 for all a and b in G.
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