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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.AG1999
Contractions of Symplectic Varieties
Jan Wierzba
We consider birational projective contractions f:X -> Y from a smooth symplectic variety X over the complex numbers. We first show that exceptional rational curves on X deform in a…