Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 2 - Set Theory - 2.2 Subsets - Exercise Set 2.2 - Page 68: 7


{x | x is a cat} ⊄ {x | x is a black cat}

Work Step by Step

As cats other then black color of the first set is not present in the second set. Therefore {x | x is a cat} ⊄ {x | x is a black cat}
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