Let X be a smooth n-dimensional projective variety over an algebraically closed field k such that KX is not nef. We give a characterization of non nef extremal rays of X of maximal length (i.e of length n - 1); in the case of Char(k) = 0 we also characterize non nef rays of length n - 2.
Special rays in the Mori cone of a projective variety
Occhetta, Gianluca;Andreatta, Marco
2002-01-01
Abstract
Let X be a smooth n-dimensional projective variety over an algebraically closed field k such that KX is not nef. We give a characterization of non nef extremal rays of X of maximal length (i.e of length n - 1); in the case of Char(k) = 0 we also characterize non nef rays of length n - 2.File in questo prodotto:
Non ci sono file associati a questo prodotto.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione
