October 27th, 2013, 02:47 PM  #1 
Newbie Joined: Sep 2013 Posts: 17 Thanks: 0  Ring
Hi . How I prove this ? : If R a ring with 1. Prove that in R ? anny suggestions ? 
October 27th, 2013, 04:29 PM  #2  
Senior Member Joined: Aug 2012 Posts: 2,259 Thanks: 682  Re: Ring Quote:
(1)(1)  1 = (1)(1) + (1) = (1)(1) + (1)1 = (1)(1 + 1) by the distributive law = (1)0 = 0 so (1)(1) = 1  

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