2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/72610Let $k$ be any field and $k^s$ its separable closure. Let $X$ be an affine variety over $k$ which is isomorphic to affine $n$-space over the field extension $k^s$. Then $X$ is isomorphic to affine $n$ space over $k$.Algebraic GeometryCommutative Algebratext