Intersection
The intersection of two sets \(A\) and \(B\), denoted \(A \cap B\), is the set of elements which are in both \(A\) and \(B\).
Formally stated, where \(C = A \cap B\)
$$x \in C \leftrightarrow (x \in A \land x \in B)$$
That is, Iff \(x\) is in the intersection \(C\), then \(x\) is in \(A\) and \(x\) is in \(B\).
For example,
\(\{1,2\} \cap \{2,3\} = \{2\}\)
\(\{1,2\} \cap \{8,9\} = \{\}\)
\(\{0,2,4,6\} \cap \{3,4,5,6\} = \{4,6\}\)
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