A set-like object in which order is ignored, but multiplicity is explicitly significant. Therefore, multisets and are equivalent, but and differ. The number of multisets of length on symbols is called multichoose , denoted .
See also
Aggregate, Ball Picking, Binomial Coefficient, Choose, Collection, Combination, List, Multichoose, Multinomial Coefficient, Permutation, Set, String
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References
Skiena, S. Implementing Discrete Mathematics: Combinatorics and Graph Theory with Mathematica. Reading, MA: Addison-Wesley, p. 12, 1990.
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Cite this as:
Weisstein, Eric W. "Multiset." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Multiset.html