Answer
{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}
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
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
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