Brandt semigroup

A Brandt semigroup is a specific type of algebraic structure that arises in the context of semigroups, which are sets equipped with an associative binary operation. More formally, a Brandt semigroup is defined as follows: A Brandt semigroup is a semigroup of the form \( B_{n}(G) \) for some positive integer \( n \) and some group \( G \).