Multiset

In mathematics, a multiset (or bag) is a generalization of the concept of a set that, unlike a set, allows multiple instances of the multiset's elements. For example, ${a, a, b}$ and ${a, b}$ are different multisets although they are the same set. However, order does not matter, so ${a, a, b}$ and ${a, b, a}$ are the same multiset.

单词	Subbag
释义	Subbag 英语百科 Multiset In mathematics, a multiset (or bag) is a generalization of the concept of a set that, unlike a set, allows multiple instances of the multiset's elements. For example, ${a, a, b}$ and ${a, b}$ are different multisets although they are the same set. However, order does not matter, so ${a, a, b}$ and ${a, b, a}$ are the same multiset.
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Subbag

Multiset