Definition:Division Ring

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Definition

A division ring is a ring with unity $\struct {R, +, \circ}$ with the following properties:


Definition 1

$\forall x \in R^*: \exists! x^{-1} \in R^*: x^{-1} \circ x = x \circ x^{-1} = 1_R$

where $R^*$ denotes the set of elements of $R$ without the ring zero $0_R$:

$R^* = R \setminus \set {0_R}$

That is, every non-zero element of $R$ has a (unique) non-zero product inverse.


Definition 2

Every non-zero element of $R$ is a unit.


Definition 3

$R$ has no proper elements.


Also see

  • Results about division rings can be found here.


Sources