👉 In logic, an "iffier" is a logical operator used in set theory and mathematics to test if two sets have no elements in common. This means that the corresponding statements are logically equivalent, meaning that they both either both contain or neither contain any element from another set. For example, if we have two sets A = {a, b} and B = {b, c}, then: 1. If A contains a, then B does not contain a. 2. If A does
