Question: The variety $X=V(x^2+y^2-1) \subseteq k^2$ is isomorphic to k if and only if $k$ has characteristic 2.
I don't even know where to start....Can anyone give me a hint?
2026-03-27 22:57:32.1774652252
The variety $X=V(x^2+y^2-1) \subseteq k^2$ is isomorphic to k if and only if $k$ has characteristic 2
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