elements are listed does not matter in discriminating multisets, so and denote the same multiset. To distinguish between sets and multisets, a notation that incorporates square brackets is sometimes used: the multiset can be denoted by .

The cardinality or "size" of a multiset is the sum of the multiplicities of all its elements. For example, in the multiset the multiplicities of the members , , and are respectively 2, 3, and 1, and therefore the cardinality of this multiset is 6.

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