Definition:Quotient Structure

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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

  • Results about quotient structures can be found here.

Linguistic Note

The word quotient derives from the Latin word meaning how often.