7 also referred to as an unordered selection | A set of integers is naturally written from smallest to largest; a set of letters is written in lexicographic order |
---|---|
When the term combination is used to refer to either situation as in care must be taken to clarify whether sets or multisets are being discussed | "A compact representation of permutation groups" |
Patterns in Permutations and Words | The order is often implicitly understood |
---|---|