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  3. for sets a and b we may define the set difference

For sets A and B we may define the set difference measure as |A_B| (the cardinality...

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Advance Math

For sets A and B we may define the set difference measure as|A_B| (the cardinality of the set A-B), explain why this is nevernegative. We know this is not a distance, explain why and modify itso that it is a distance. Prove your claim (in particular becareful to show the triangle inequality holds)

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