Definition:Quotient Structure

Definition
Let $\struct {S, \circ}$ be an algebraic structure.

Let $\RR$ be a congruence relation on $\struct {S, \circ}$.

Let $S / \RR$ be the quotient set of $S$ by $\RR$.

Let $\circ_\RR$ be the operation induced on $S / \RR$ by $\circ$.

The quotient structure defined by $\RR$ is the algebraic structure:
 * $\struct {S / \RR, \circ_\RR}$

If there is no danger of confusion, we can drop the $\RR$ from $\circ_\RR$ and use $\circ$ for both the operation on $S$ and the induced operation on $S / \RR$.

Also see

 * Quotient Structure is Well-Defined