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 .
Multiset
See also
Aggregate, Ball Picking, Binomial Coefficient, Choose, Collection, Combination, List, Multichoose, Multinomial Coefficient, Permutation, Set, StringExplore with Wolfram|Alpha
References
Skiena, S. Implementing Discrete Mathematics: Combinatorics and Graph Theory with Mathematica. Reading, MA: Addison-Wesley, p. 12, 1990.Referenced on Wolfram|Alpha
MultisetCite this as:
Weisstein, Eric W. "Multiset." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Multiset.html