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(1989)We show that every arithmetically Cohen-Macaulay two-codimensional subscheme ofPn can be deformed to a reduced union of two-codimensional linear subvarieties. This problem (classical for curves with the name of Zeuthen ...
(1989)We study rank-2 reflexive sheaves on P3 whose sections are Buchsbaum curves, giving vanishing theorems for the cohomology and bounds and gaps for the existence range of their Chern classes. These results are applied to ...