👉 In mathematics, a concordance is a set of two or more sets that are mutually exclusive and have no elements in common. In other words, if you have a list of items, and you want to include only those items that are also present in another list, then the lists must be disjoint (no overlap). For example, if you have a list of numbers {1, 2, 3}, and another list of numbers {4, 5, 6}, then the