Question 2. (I) Let R be a ring. Show that every unit is not a zero divisor.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter8: Polynomials
Section8.1: Polynomials Over A Ring
Problem 16E: a. If R is a commutative ring with unity, show that the characteristic of R[ x ] is the same as the...
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Question 2.
[5, 4, 5, 6]
(I) Let R be a ring. Show that every unit is not a zero divisor.
(II) Let R be an integral domain such that its characteristic is not zero.
(a) Let n e N be the characteristic of R. Show that n + 1.
(b) Since n > 1, let p be a prime divisor of n.
(i) Show that ( 1R) # 0r and (p·1r) = 0, where 1r and OR are respectively the identity
and zero element of the ring.
(ii) Conclude that n = p.
Transcribed Image Text:Question 2. [5, 4, 5, 6] (I) Let R be a ring. Show that every unit is not a zero divisor. (II) Let R be an integral domain such that its characteristic is not zero. (a) Let n e N be the characteristic of R. Show that n + 1. (b) Since n > 1, let p be a prime divisor of n. (i) Show that ( 1R) # 0r and (p·1r) = 0, where 1r and OR are respectively the identity and zero element of the ring. (ii) Conclude that n = p.
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