👉 In mathematics, a set is said to be reducible if it can be expressed as a union of two or more sets. In other words, a set is reducible if its elements can be grouped into smaller sets that are themselves subsets of the original set. For example, the set {1, 2} can be written as {1} ∪ {2}, where each element in the first set (1) is included in the union with an element from the second set