Let \(R\) be a commutative ring. An ideal \(I \normal R\) is principal if there exists \(a\in R\) such that \(I = \gens{a} = Ra\).
Principal ideal
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Let \(R\) be a commutative ring. An ideal \(I \normal R\) is principal if there exists \(a\in R\) such that \(I = \gens{a} = Ra\).