👉 In mathematics, idlenesses are a type of noncommutative ring. Unlike commutative rings, idlenesses do not have an identity element and thus cannot be used in the definition of an identity or inverses for elements. An idenity is a relation between two sets that makes them equal under their operations. For example, if A = {a} and B = {b}, then (A ∪ B) ∩ C = A ∩ C ∪ B
