Answer
Done below.
Work Step by Step
a) $A \cup A = \{x : x \in A \vee x \in A \} = \{x : x \in A \} = A$
b) $A \cap A = \{x : x \in A \wedge x \in A \} = \{x : x \in A \} = A.$
Discrete Mathematics and Its Applications, Seventh Edition
by Rosen, Kenneth
Published by
McGraw-Hill Education
ISBN 10:
0073383090
ISBN 13:
978-0-07338-309-5
Chapter 2 - Section 2.2 - Set Operations - Exercises - Page 136: 8
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