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Problem
Decide whether each statement is true or false: a.
N
⊂
Q
\mathbb{N} \subset \mathbb{Q}
N
⊂
Q
b.
0
∈
Z
+
0 \in \mathbb{Z}^+
0
∈
Z
+
c.
0
∈
Q
0 \in \mathbb{Q}
0
∈
Q
d.
R
⊆
Q
\mathbb{R} \subseteq \mathbb{Q}
R
⊆
Q
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