Answer
empty set, subset
Work Step by Step
The statement ∅⊆ B tells us that the empty set is a subset of every set.
Means ∅ represents empty set and ⊆ represents subset.
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 - Concept and Vocabulary Check - Page 67: 3
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