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T3R723
2012-03-21 5:00
01234 3T3H7R5910D7
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Anonymous
2013-08-31 12:52
If X and Y are disjoint, addition is given by the union of X and Y. If the two sets are not already disjoint, then they can be replaced by disjoint sets of the same cardinality, e.g., replace X by X×{0} and Y by Y×{1}.
|X| + |Y| = | X ∪ Y|.
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