Definition:Quasi-Affine Variety
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Definition
Let $k$ be a field.
Let $n \ge 1$ be an Integer.
Let $k^n$ be equipped with Zariski topology.
Then a subset $Y \subseteq k^n$ is an quasi-affine variety if and only if $Y$ is an open set of an affine algebraic variety.
Sources
- 1977: Robin Hartshorne: Algebraic Geometry $\text{I}.1$ Affine Varieties