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Lets say I have a list: $L:=(a,b,c,d)$ of objects from some space. I can call $L$ as set iff each element is unique, otherwise, the set associated with $L$ will have fewer elements than L.

Is there a mathematical term for $L$: a collection of objects that may or may not be unique?

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    $\begingroup$ Google for multiset $\endgroup$ – user251257 Aug 11 '15 at 13:39
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    $\begingroup$ In computer science it is often called a bag $\endgroup$ – MJD Aug 11 '15 at 14:13
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We have the notion of a multiset

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  • $\begingroup$ Perfect!! Thanks so much. Ill accept in 13 minutes. $\endgroup$ – user237392 Aug 11 '15 at 13:40

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