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math.AG2002
Small Contractions of Symplectic 4-folds
Jan Wierzba, Jaroslaw A. Wisniewski
We classify small contractions of (holomorphically) symplectic 4-folds.
math.AG1998
Projective Contact Manifolds
Stefan Kebekus, Thomas Peternell, Andrew J. Sommese +1
We prove that a projective contact manifold X with second Betti number at least 2 whose canonical bundle K_X is not nef, is always the projectivised tangent bundle P(T_Y) of a proj…
math.AG1998
Cohomological invariants of complex manifolds coming from extremal rays
Jaroslaw A. Wisniewski
In the present paper Mori extremal rays of a smooth projective manifold X are divided into two classes: L-supported and L-negligible (where ``L'' stands for ``Lefschetz'' since the…