There is a problem with the example:
Thus, if the order of occurrence is ignored, the set {c, b, c, a, c, c, a, b, c, b, b, a} which contains twelve elements, contains only three distinct elements- a, b, c. Such a set will be said to have a variety of three elements.
According to http://en.wikipedia.org/wiki/Set, members of a set should be unique, unlike a multiset. So {c, b, c, a, c, c, a, b, c, b, b, a} is a multiset, the set representation of this multiset is {a,b,c} which has cardinality (number of members) 3, equal to the variety.
83.87.130.80 (talk) 16:26, 5 December 2007 (UTC)
