More generally, let f(x) be an arbitrary polynomial, and let (f(x)) denote the set of all polynomials that are a multiple of f(x), i.e. the set {f(r)g(x)| g(x) E R[r]}. Show that (f(x)) is an ideal of R[r].

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter5: Rings, Integral Domains, And Fields
Section5.2: Integral Domains And Fields
Problem 5E: Examples 5 and 6 of Section 5.1 showed that P(U) is a commutative ring with unity. In Exercises 4...
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abstract algebra

Example 2.68
In the ring R], let (x) denote the set of all polynomials that are a
multiple of r, i.e. the set {rg(x) | g(x) E R[c]}.
1
xe
Exercise 2.68.2
More generally, let f(x) be an arbitrary polynomial, and let (f(x))
denote the set of all polynomials that are a multiple of f(x), i.e. the
set {f(x)g(x) | g(x) E R[r]}. Show that (f(x)) is an ideal of R[r].
Transcribed Image Text:Example 2.68 In the ring R], let (x) denote the set of all polynomials that are a multiple of r, i.e. the set {rg(x) | g(x) E R[c]}. 1 xe Exercise 2.68.2 More generally, let f(x) be an arbitrary polynomial, and let (f(x)) denote the set of all polynomials that are a multiple of f(x), i.e. the set {f(x)g(x) | g(x) E R[r]}. Show that (f(x)) is an ideal of R[r].
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