A proper subset (A union B)
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proper subset (A union B)Symbol Meaning Example
A ∪ B Union: in A or B (or both) C ∪ D = {1, 2, 3, 4, 5}
A ∩ B Intersection: in both A and B C ∩ D = {3, 4}
A ⊆ B Subset: every element of A is in B. {3, 4, 5} ⊆ D
A ⊂ B Proper Subset: every element of A is in B, but B has more elements. {3, 5} ⊂ D
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