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Wikipedia definition
1. Unit (ring theory)In mathematics, an invertible element or a unit in a ring R refers to any element u that has an inverse element in the multiplicative monoid of R, i.e. such element v that uv = vu = 1R, where 1R is the multiplicative identity element. The set of units of any ring is closed under multiplication (the product of two units is again a unit), and forms a group for this operation.
Read “Unit (ring theory)” on English Wikipedia
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