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