(a) Suppose : R→ S is a ring isomorphism. Show that if z is a zero divisor in R, then (2) is a zero divisor in S. (b) Show that if : R→ S is only assumed to be a ring homomorphism, then it is possible to have a zero divisor z R for which o(z) is not a zero divisor in S.
(a) Suppose : R→ S is a ring isomorphism. Show that if z is a zero divisor in R, then (2) is a zero divisor in S. (b) Show that if : R→ S is only assumed to be a ring homomorphism, then it is possible to have a zero divisor z R for which o(z) is not a zero divisor in S.
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter4: More On Groups
Section4.7: Direct Sums (optional)
Problem 19E: 19. a. Show that is isomorphic to , where the group operation in each of , and is addition.
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