Question
Show that if $C$ is a condition that elements of the $n$ -ary relations $R$ and $S$ may satisfy, then$s_{C}(R \cap S)=s_{C}(R) \cap s_{C}(S)$
Step 1
It selects all elements from a relation that satisfy a certain condition $C$. So, $s_{C}(R)$ is the set of all elements in $R$ that satisfy $C$, and similarly for $s_{C}(S)$. Show more…
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