ON PROJECTIVE MANIFOLDS SWEPT OUT BY CUBIC VARIETIES
2012 ◽
Vol 23
(07)
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pp. 1250058
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We study structures of embedded projective manifolds swept out by cubic varieties. We show if an embedded projective manifold is swept out by high-dimensional smooth cubic hypersurfaces, then it admits an extremal contraction which is a linear projective bundle or a cubic fibration. As an application, we give a characterization of smooth cubic hypersurfaces. We also classify embedded projective manifolds of dimension at most five swept out by copies of the Segre threefold ℙ1 × ℙ2. In the course of the proof, we classify projective manifolds of dimension five swept out by planes.
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1998 ◽
Vol 07
(04)
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pp. 503-508
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2006 ◽
Vol 179
(5)
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pp. 1478-1485
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2012 ◽
Vol 142
(4)
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pp. 863-871
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