Recall that
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter6: More On Rings
Section6.1: Ideals And Quotient Rings
Problem 9E: Find the principal ideal (z) of Z such that each of the following sums as defined in Exercise 8 is...
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Recall that a finitely-generated ideal I is written I = (x1 , x2 , . . . , xn) where the xi ∈ R are
such that every y ∈ I can be written y = r1x1 + · · · + rnxn for suitable choices of ri ∈ R.
(a) Let R = Z and I = (4, 6). Show that I is principal and is generated by 2 ∈ Z.
(b) Do the same for I = (6, 9, 15). Find a generator.
(c) Now let R = Z5[x] and I = (x2 + 1, x5 + 2). Is I a principal ideal? If so, find a generator.
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