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Projective blowups: a formal and multicentered proof
We give a machine-checked proof, in Lean 4, of the universal property of multicentered blowups: given a finite family $Z$ of closed subschemes of a scheme $X$, presented on each chart by ideals, there is a scheme $\Bl_Z X$ over $X$, terminal among $X$-schemes on which every member of the family beco
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