👉 Underthane is a concept in mathematics, specifically in set theory and related fields. It refers to a subset of a given set that contains all but one element of the original set. For example, consider the set S = {1, 2, 3, 4} with its elements being {1, 2}. In this case, the underthane of S is the set containing only the element 1: {1}. Similarly, if we have a set A = {a
