👉 In mathematics, a "retrocessional" is an element of a ring that satisfies certain properties. In other words, it's defined as an element x such that if one divides by x, then the quotient z = ÷x also has the property of being in the same class with x. For example, let R be the ring of integers modulo 2 (where 0 is considered to be positive and negative). Then the element 3 is a retrocessional in R because
