👉 In mathematics, a rostellarian is a type of algebraic object that can be defined as an algebraic structure in which every element has a multiplicative inverse. This means that for any two elements x and y in the set of elements under consideration, there exists an element z such that xy = yz = 1. This concept was introduced by the Russian mathematician Leonid Kantorovich in the early 20th century. A rostellarian is a type of ring or