Symplectic geometry and rationally connected 4-folds

JOURNAL FUR DIE REINE UND ANGEWANDTE MATHEMATIK（2015）

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摘要

We study some symplectic geometric aspects of rationally connected 4-folds. As a corollary, we prove that any smooth projective 4-fold symplectic deformation equivalent to a Fano 4-fold of pseudo-index at least 2 or a rationally connected 4-fold whose second Betti number is 2 is rationally connected.

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