In a ring with identity, prove that (−1) · (−1)= 1.

Question

I'm not sure how to start this problem with Rings, could someone perhaps lead me in the right direction?

Hello: please read the guidelines for how to ask for tips to remember before you ask, and also at this post for question quality. — rschwieb, Oct 16 '18 at 16:44

score 3 · Answer 1 · answered Oct 16 '18 at 16:41

3

Hint: Prove that $(-1)(-1)+(-1)=0$.

answered Oct 16 '18 at 16:41

1 Answers1