👉 In mathematics, a sub-ensemble is a subset of a set that contains only one element. In other words, it's a collection of elements that are not in any larger set. For example, consider the set A={1, 2, 3}. The sub-ensemble of A containing only 1, denoted as {1}, is an example of a suballiance. In set theory, a sub-ensemble is also known as a subset or a constituent element. It