# Chapter R - Review of Basic Concepts - R.1 Sets - R.1 Exercises: 65

$\not \subseteq$

#### Work Step by Step

$A \subseteq B$ if all elements of set A are also elements of set B. Note that an element of the set on the left ($0$ in particular) is not an element of the set on the right This means that the set on the left is NOT a subset of the set on the right. Thus, the missing expression in the blank is $\not \subseteq$.

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