If is a homomorphism from the ring R to the ring R' , show that; a) (0)=0 b) (−r)= −(r)for all rR

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter5: Rings, Integral Domains, And Fields
Section5.1: Definition Of A Ring
Problem 17E: If R1 and R2 are subrings of the ring R, prove that R1R2 is a subring of R.
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If is a homomorphism from the ring R to the ring R' , show that; a) (0)=0

b) (−r)= −(r)for all rR

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