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==Geometrical interpretation==
In the preceding formulation, the [[polynomial ring]] <math>R[\mathbf x]=R[x_1, \ldots, x_n]</math> defines a morphism of [[Scheme (mathematics)|schemes]] (which are algebraic varieties if {{mvar|R}}
:<math>\mathbb{P}^{n-1}_R = \operatorname{Proj}(R[\mathbf x]) \to \operatorname{Spec}(R).</math>
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