Discrete Mathematics with Applications 4th Edition

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

Chapter 4 - Elementary Number Theory and Methods of Proof - Exercise Set 4.7 - Page 212: 8

Answer

This statement is false.

Work Step by Step

This statement is false. Claim: The difference of any two irrational numbers is irrational. Counterexample: Let r = π and s = π, then r – s = π – π = 0. By definition of rational, r – s = 0 is rational (since it can be expressed as a quotient, such as 0/1). This contradicts the statement and demonstrates that the difference of any two irrational numbers is not irrational.
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