Answer
$\subseteq$
Work Step by Step
RECALL:
The empty set is a subset of any other set.
The rule above means that the empty set is a subset of itself.
Thus, the missing expression in the blank is $\subseteq$.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter R - Review of Basic Concepts - R.1 Sets - R.1 Exercises - Page 8: 68
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