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Curve sottocanoniche, fibrati e fasci riflessivi suP 3

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Si esaminano varie condizioni affinché una curva sottocanonica diP 3 sia intersezione completa (un fibrato di rango 2 sia spezzato); ovvero affinché una curva localmente intersezione completa sia sottocanonica (un fascio riflessivo di rango 2 sia un fibrato). Le condizioni si esprimono mediante annullamento a vari livelli del 1o e 2o modulo di coomologia dell’ideale della curva o del fascio.

Summary

The paper considers some conditions that force a subcanonical curve inP 3 to be complete intersection (a rank 2 bundle to be split) or a locally complete intersection curve to be subcanonical (a rank 2 reflexive sheaf to be a bundle). The conditions involve the vanishing at various levels of the 1st and 2nd cohomology module of the ideal of the curve or of the sheaf.

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Bibliografia

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Valabrega, P. Curve sottocanoniche, fibrati e fasci riflessivi suP 3 . Seminario Mat. e. Fis. di Milano 57, 47–54 (1987). https://doi.org/10.1007/BF02925041

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  • DOI: https://doi.org/10.1007/BF02925041

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