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Using basic operators, derive the additional operator intersection.

$R \cap S = ?$

I thought it might be: $(R \cup S) - ((R -S) \cup (S -R))$ but I also think there might be an easier way of doing it?

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    OK, I get it now. Thanks!2011-01-18

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You could write $R \cap S = R-(R-S)$ or $R \cap S = S-(S-R)$. As Arturo mentioned, you are looking at one set and throwing away everything that is just in that set.