Classification of projective surfaces with small sectional genus : char >
M. Andreatta, E. Ballico (1990)
Rendiconti del Seminario Matematico della Università di Padova
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Displaying similar documents to “Minimal sections of conic bundles”
Classification of projective surfaces with small sectional genus : char >
The Fano surface of the Gushel threefold
Atanas Iliev (1994)
Compositio Mathematica
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On threefolds admitting a bielliptic curve as abstract complete intersection.
Del Centina, A., Gimigliano, A. (2001)
Advances in Geometry
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Seshadri positive curves in a smooth projective -fold
Roberto Paoletti (1995)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
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A notion of positivity, called Seshadri ampleness, is introduced for a smooth curve in a polarized smooth projective -fold , whose motivation stems from some recent results concerning the gonality of space curves and the behaviour of stable bundles on under restriction to . This condition is stronger than the normality of the normal bundle and more general than being defined by a regular section of an ample rank- vector bundle. We then explore some of the properties of Seshadri-ample...
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.
Threefolds with nef anticanonical bundles.
Thomas Peternell, Fernando Serrano (1998)
Collectanea Mathematica
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In this paper we study the global structure of projective threefolds X whose anticanonical bundle -KX is nef.
Contractions of smooth varieties. II. Computations and applications
Marco Andreatta, Jarosław A. Wiśniewski (1998)
Bollettino dell'Unione Matematica Italiana
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Una contrazione su una varietà proiettiva liscia è data da una mappa propria, suriettiva e a fibre connesse in una varietà irriducibile normale . La contrazione si dice di Fano-Mori se inoltre è -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...