Set with exactly one element
For a sequence with one member, see
1-tuple.
In mathematics, a singleton (also known as a unit set[1] or one-point set) is a set with exactly one element. For example, the set
is a singleton whose single element is
.
- ^ Stoll, Robert (1961). Sets, Logic and Axiomatic Theories. W. H. Freeman and Company. pp. 5–6.