What is the difference between a subset and a proper subset?
A proper subset all elements from P are in Q but Q can have more elements then in P. Subset all elements means the sets are the same. Think of greater then or equal too notaion
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Venn diagram: Union
Everything in A and B
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Venn diagram: Intersection
Things that apear only in both A and B
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Venn diagram: Difference
Means what appears in A but not in B even if it's included in A
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