Contemporary Abstract Algebra
Contemporary Abstract Algebra
9th Edition
ISBN: 9781305657960
Author: Joseph Gallian
Publisher: Cengage Learning
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Chapter 12, Problem 39E

Suppose that R is a ring with unity 1 and a is an element of R suchthat a2=1 . Let S={ara|rR} . Prove that S is a subring of R.Does S contain 1?

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