Question
Show, as in Examples 1.1 .5 and $1.1 .6,$ that $A \subseteq B$.$A=\{1\} \times\{1,2\}, B=\{1\} \times\{1,2,3\}$
Step 1
These are Cartesian products of two sets. The Cartesian product of two sets $X$ and $Y$, denoted $X \times Y$, is the set of all ordered pairs $(x, y)$ where $x \in X$ and $y \in Y$. Show more…
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Show, as in Examples 1.1 .5 and $1.1 .6,$ that $A \subseteq B$. $A=\{1,2\}, B=\{3,2,1\}$
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