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