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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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