8. Unions and Intersections of Sets
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The symbol ⋂ indicates the intersection of two sets.
X⋂ Z=∅
X&={2, 4, 6, 8, 10} Z&={1, 3, 5, 7, 9} The intersection of two sets is the set that contains elements that are common in both sets. An element is in the intersection of X and Z if it belongs to X and to Z at the same time. Notice that sets X and Z share no common elements. Therefore, the intersection of those sets is an empty set. X⋂ Z=∅