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Results tagged with characteristic-2
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user 37622
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votes
Effectiveness of the distinguished theta characteristic in characteristic 2
Let $F:X\to X$ be the relative Frobenius morphism. It is a finite morphism of degree $2$, and we have an exact sequence
$$0\to \mathcal{O}_X\to F_*\mathcal{O}_X \to L \to 0$$
for some invertible shea …
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