Why is the union operation not expressed in terms of the intersection and difference operations?

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altair_u2015-10-30 13:33:46

Database

altair_u, 2015-10-30 13:33:46

Why is the union operation not expressed in terms of the intersection and difference operations?

Please help with the question
Option 1 because it is commutative
Option 2 because the intersection operation itself is redundant
Option 3 because the power of its result is greater than the power of each of the operands, if one of them is not an empty set

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