Question
Prove each, where $A, B,$ and $C$ are any sets.$$\left(A^{\prime}\right)^{\prime}=A$$
Step 1
This means that $x$ is not in $A^{\prime}$, which implies that $x$ is in $A$. Therefore, we can say that $\left(A^{\prime}\right)^{\prime} \subseteq A$. Show more…
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