{
  "aliases": [
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  "body": "\n## Summary\n\nIn mathematics, a **multiset** (or **bag**, or **mset**) is a modification of the concept of a [[set|0BSJ7RQ9BW]] that, unlike a set, allows for multiple instances for each of its elements. The number of instances given for each element is called the *multiplicity* of that element in the multiset. As a consequence, an infinite number of multisets exist that contain only elements $a$ and $b$, but vary in the multiplicities of their elements:\n",
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