Higher dimensional polarized varieties with non-integral nefvalue.

Beltrametti, Mauro C.; Di Termini, Susanna

Displaying similar documents to “Higher dimensional polarized varieties with non-integral nefvalue.”

Extending extremal contractions from an ample section.

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On the dimension of the adjoint linear system for threefolds

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Alzati, Alberto, Tortora, Alfonso (2002)

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Una contrazione su una varietà proiettiva liscia $X$ è data da una mappa $φ : X \to Z$ propria, suriettiva e a fibre connesse in una varietà irriducibile normale $Z$ . La contrazione si dice di Fano-Mori se inoltre $- K_{X}$ è $φ$ -ampio. Nel lavoro, naturale seguito e completamento delle ricerche introdotte in [A-W3], si studiano diversi aspetti delle contrazioni di Fano-Mori attraverso esempi (capitolo 1) e teoremi di struttura (capitoli 3 e 4). Si discutono anche alcune applicazioni allo studio di morfismi birazionali...

On threefolds admitting a bielliptic curve as abstract complete intersection.

Del Centina, A., Gimigliano, A. (2001)

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Hironobu Maeda (1986)

Compositio Mathematica

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Threefolds with big and nef anticanonical bundles II

Priska Jahnke, Thomas Peternell, Ivo Radloff (2011)

Open Mathematics

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In a follow-up to our paper [Threefolds with big and nef anticanonical bundles I, Math. Ann., 2005, 333(3), 569–631], we classify smooth complex projective threefolds Xwith −K X big and nef but not ample, Picard number γ(X) = 2, and whose anticanonical map is small. We assume also that the Mori contraction of X and of its flop X + are not both birational.

Seshadri positive submanifolds of polarized manifolds

Lucian Bădescu, Mauro Beltrametti (2013)

Open Mathematics

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Let Y be a submanifold of dimension y of a polarized complex manifold (X, A) of dimension k ≥ 2, with 1 ≤ y ≤ k−1. We define and study two positivity conditions on Y in (X, A), called Seshadri A-bigness and (a stronger one) Seshadri A-ampleness. In this way we get a natural generalization of the theory initiated by Paoletti in [Paoletti R., Seshadri positive curves in a smooth projective 3-fold, Atti Accad. Naz. Lincei Cl. Sci. Fis. Mat. Natur. Rend. Lincei (9) Mat. Appl., 1996, 6(4),...

Ample vector bundles with sections vanishing along conic fibrations over curves.

Tommaso De Fernex (1998)

Collectanea Mathematica

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