👉 In mathematics, an "errancy" is a mathematical concept that refers to the relationship between two sets of numbers. It can be defined as the set difference between two given sets. A set difference, also known as the difference set operation, is used in various fields such as computer science and mathematics, particularly in operations research, where it is often used to perform calculations on sets. For example, in a set A = {1, 2, 3} and B = {4,
