Cycles, derived categories, and rationality

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In the study of the geometry of a Fano threefold X of the first kind, an essential role is played by lines or conics on X (the degree is com- puted with respect to the ample class

We shall suppose that the branch locus S has at most finitely many isolated double points... The point is that these four lines have a common

Toute utilisa- tion commerciale ou impression systématique est constitutive d’une in- fraction pénale.. Toute copie ou impression de ce fichier doit conte- nir la présente mention

Mumford proves that the intermediate Jacobian of X is isomorphic, as polarized abelian variety, to a so-called Prym variety.. This last part of Mumford’s proof is

In the Chow ring A(X), etc., we mean to take the cycles rational over a fixed sufficiently large and algebraically closed overfield of k (a ’universal domain’)... The

Thus, hedefi ned the multiplication of two cardinal numbers 1, and, although the extension of this definition to a transfinite number of cardinal numbers

Suppose R is a right noetherian, left P-injective, and left min-CS ring such that every nonzero complement left ideal is not small (or not singular).. Then R