Outside of factorization (integers into primes, polynomials into irreducibles) where else are multisets naturally useful in mathematics?
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See [here](https://en.wikipedia.org/wiki/Multiset), for example. – Dietrich Burde Jul 07 '15 at 20:33
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2Statistics, at least as far as the basics are concerned (mean, median, mode, etc.). – Ken Jul 07 '15 at 21:50