A **unit** in a commutative ring $R$ is an element $x \in R$ so that there exists $y \in R$ with $xy = 1$. The set of units in $R$ is denoted $R^*$ or $R^\times$ and forms a group under multiplication.

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- Review status: reviewed
- Last edited by John Voight on 2020-10-23 11:21:08

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- 2020-10-23 11:21:08 by John Voight (Reviewed)
- 2020-10-23 11:17:40 by Andrew Sutherland
- 2020-10-23 11:17:40 by Andrew Sutherland
- 2020-10-13 17:52:58 by David Roe
- 2020-10-13 17:45:28 by David Roe
- 2020-10-13 17:44:52 by David Roe

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