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October 27th, 2013, 03:47 PM   #1
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Ring

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


Prove that in R ?

anny suggestions ?
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October 27th, 2013, 05:29 PM   #2
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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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