Definition:Regular Representations

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Definition

Let $\struct {S, \circ}$ be a magma.


Left Regular Representation

The mapping $\lambda_a: S \to S$ is defined as:

$\forall x \in S: \map {\lambda_a} x = a \circ x$


This is known as the left regular representation of $\struct {S, \circ}$ with respect to $a$.


Right Regular Representation

The mapping $\rho_a: S \to S$ is defined as:

$\forall x \in S: \map {\rho_a} x = x \circ a$


This is known as the right regular representation of $\struct {S, \circ}$ with respect to $a$.


Also defined as

Some treatments of abstract algebra and group theory define the regular representations for semigroups.

Some define it only for groups.


Also see

  • Results about regular representations can be found here.


Sources