交換代數中,諾特正規化引理是一個技術性的定理,以德國數學家埃米·諾特命名。其內容如下:

是有限生成的 -代數,且 整環,則存在 ,使得 上彼此代數獨立,且 整擴張

它的一個重要幾何結論之一是:任一射影簇均可表為仿射空間的分歧覆蓋

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