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Lefschetz for local Picard groups (1302.3189v1)
Published 13 Feb 2013 in math.AG and math.AC
Abstract: We prove a strengthening of the Grothendieck-Lefschetz hyperplane theorem for local Picard groups conjectured by Koll\'ar. Our approach, which relies on acyclicity results for absolute integral closures, also leads to a restriction theorem for higher rank bundles on projective varieties in positive characteristic.
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