If R is a commutative ring with unity and a e R, then (a) = {ar : reR}=aR.
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 15E: 15. Prove that if is an ideal in a commutative ring with unity, then is an ideal in .
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