Contemporary Abstract Algebra
Contemporary Abstract Algebra
9th Edition
ISBN: 9781305657960
Author: Joseph Gallian
Publisher: Cengage Learning
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Chapter 12, Problem 22E

Let R be a commutative ring with unity and let U(R) denote the setof units of R. Prove that U(R) is a group under the multiplication ofR. (This group is called the group of units of R.)

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