Prove that in any ring R, 0 xa= 0 for all real numbersa.

Also prove that in any ring R,

(-1)a= -afor all real numbersa.

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- Feb 11th 2010, 03:38 PMmeggnogRings
Prove that in any ring R, 0 x

*a*= 0 for all real numbers*a*.

Also prove that in any ring R,

(-1)*a*= -*a*for all real numbers*a*. - Feb 12th 2010, 05:18 AMtonio
- Feb 13th 2010, 04:08 AMITStuff
a is Natural, number or can be anything!?