Higher dimensional polarized varieties with non-integral nefvalue.
Beltrametti, Mauro C., Di Termini, Susanna (2003)
Advances in Geometry
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Beltrametti, Mauro C., Di Termini, Susanna (2003)
Advances in Geometry
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Del Centina, A., Gimigliano, A. (2001)
Advances in Geometry
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Hironobu Maeda (1986)
Compositio Mathematica
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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.
M. C. Beltrametti, A. J. Sommese (1995)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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E. Izadi (1999)
Bulletin de la Société Mathématique de France
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Kiyohiko Takeuchi (1989)
Compositio Mathematica
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Joseph Cutrone, Nicholas Marshburn (2013)
Open Mathematics
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In this paper, examples of type II Sarkisov links between smooth complex projective Fano threefolds with Picard number one are provided. To show examples of these links, we study smooth weak Fano threefolds X with Picard number two and with a divisorial extremal ray. We assume that the pluri-anticanonical morphism of X contracts only a finite number of curves. The numerical classification of these particular smooth weak Fano threefolds is completed and the geometric existence of some...