Dimension of Affine Algebraic Set is Dimension of Affine Coordinate Ring
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Theorem
Let $k$ be a field.
Let $Y \subseteq k^n$ be an affine algebraic set.
Let $\map A Y$ be the affine coordinate ring.
Then:
- $\map \dim Y = \map \dim {\map A Y}$
where:
- $\map \dim Y$ is the Krull dimension of $Y$ with respect to Zariski topology
- $\map \dim {\map A Y}$ is the Krull dimension of $\map A Y$
Proof
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Sources
- 1977: Robin Hartshorne: Algebraic Geometry $\text{I}.1$ Affine Varieties