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sebaflores October 27th, 2013 02:47 PM

Ring
 
Hi . How I prove this ? : If R a ring with 1.


Prove that in R ?

anny suggestions ?

Maschke October 27th, 2013 04:29 PM

Re: Ring
 
Quote:

Originally Posted by sebaflores
Hi . How I prove this ? : If R a ring with 1.


Prove that in R ?

anny suggestions ?


(-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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