Answer
The proof assumes its own truth to prove itself when it uses the fact that any two rational numbers produce a rational number when added together.
Work Step by Step
It is invalid.
Discrete Mathematics with Applications 4th Edition
by Epp, Susanna S.
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 4.2 - Page 169: 35
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