Discrete Mathematics with Applications 4th Edition

Published by Cengage Learning
ISBN 10: 0-49539-132-8
ISBN 13: 978-0-49539-132-6

Chapter 1 - Speaking Mathematically - Exercise Set 1.1: 12

Answer

a. real number; product with every number leaves the number unchanged b. with every number leaves the number unchanged c. the product of $r$ and $s$ is $s$ (i.e., $r\times s=s$)

Work Step by Step

The real number $r$ is, of course, one, also called the multiplicative identity.
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