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The Stacks project

Exercise 111.34.7. (For the number theorists.) Give an example of a closed subscheme

Z \subset \mathop{\mathrm{Spec}}\left({\mathbf Z}[x, \frac{1 }{ x(x-1)(2x-1)}]\right)

such that the morphism Z \to \mathop{\mathrm{Spec}}({\mathbf Z}) is finite and surjective.

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View Exercise 111.34.7 as pdf