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

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 never negative. We know this is not a distance, explain why and modify it so that it is a distance. Prove your claim (in particular be careful to show the triangle inequality holds)

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Colby Messinger answered 1 year ago

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