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arxiv: 1609.00156 · v2 · pith:RZHOBZYMnew · submitted 2016-09-01 · 🧮 math.AG

Lifting Weighted Blow-ups

classification 🧮 math.AG
keywords weightedblow-updivisorf-ampleq-factorialcartiercontractionlocal
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Let f: X -> Z be a local, projective, divisorial contraction between normal varieties of dimension n with Q-factorial singularities. Let $Y \subset X$ be a f-ample Cartier divisor and assume that f|Y: Y -> W has a structure of a weighted blow-up. We prove that f: X -> Z, as well, has a structure of weighted blow-up. As an application we consider a local projective contraction f: X -> Z from a variety X with terminal Q-factorial singularities, which contracts a prime divisor E to an isolated Q-factorial singularity $P\in Z$, such that $-(K_X + (n-3)L)$ is f-ample, for a f-ample Cartier divisor L on X. We prove that (Z,P) is a hyperquotient singularity and f is a weighted blow-up.

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