👉 Pluperfectly is a mathematical concept in set theory that refers to a partially ordered set, where every non-empty subset has an upper bound. This means that for any two elements x and y in the partially ordered set, there exists an element z such that z < x and z < y. In other words, every element of the set is either less than or equal to another element, but not necessarily both. Pluperfectly defined sets are those where every non-empty subset has a