I am trying to describe the edges of an undirected graph that contains loops. On Wikipedia they are characterized as 2-multisets, meaning it has two elements which can be identical, and the order is not important. I never heard of that term, and find no reference to it anywhere else, so I am not sure whether it is OK to use it in my thesis. Can anyone clear that up for me?
- Anybody can ask a question
- Anybody can answer
- The best answers are voted up and rise to the top
Yes. See the Wikipedia article on multisets and the many references therein for where it has occurred previously in literature.
(Note, in the context, a 2-multiset merely means a multiset containing 2 elements.)
As Willie Wong notes, it's a perfectly valid term, but at least I personally would find "unordered pair" more natural than "2-multiset".