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Divisorial contractions in dimension three which contract divisors to compound A_1 points
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classification
math.AG
keywords
contractiondimensiondivisorialblow-upcompoundcontractcontractionscontracts
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We deal with a divisorial contraction in dimension 3 which contracts its exceptional divisor to a cA_1 point. We prove that any such contraction is obtained by a suitable weighted blow-up.
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