Definition:Dipper Semigroup/Definition 2

Definition
Let $m \in \N$ be a natural number.

Let $n \in \N_{>0}$ be a non-zero natural number.

Let $\RR_{m, n}$ be the dipper relation on $\N$:


 * $\forall x, y \in \N: x \mathrel {\RR_{m, n} } y \iff \begin {cases} x = y \\ m \le x < y \text { and } n \divides \paren {y - x} \\ m \le y < x \text { and } n \divides \paren {x - y} \end {cases}$

Let $\map D {m, n} := \N / \RR_{m, n}$ be the quotient set of $\N$ induced by $\RR_{m, n}$.

Let $\oplus_{m, n}$ be the operation induced on $\map D {m, n}$ by addition on $\N$.

A dipper (semigroup) is a semigroup which is isomorphic to the algebraic structure $\struct {\map D {m, n}, \oplus_{m, n} }$.

Also see

 * Equivalence of Definitions of Dipper Semigroup