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, String## Explore 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

Multiset## Cite this as:

Weisstein, Eric W. "Multiset." From *MathWorld*--A Wolfram Web Resource. https://mathworld.wolfram.com/Multiset.html