**CANCELED** Probing homotopy 4-spheres using near-symplectic forms


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February 4, 2020 4:15 pm - 5:15 pm
Science Center 507
Address: 1 Oxford Street, Cambridge, MA 02138 USA

**CANCELED** Chris Gerig - Harvard University


Most 4-manifolds do not admit symplectic forms, but most admit 2-forms that are "nearly" symplectic. Just like the Seiberg-Witten (SW) invariants, there are Gromov invariants that are compatible with the near-symplectic form. Although (potentially exotic) 4-spheres don't admit them, there is still a way to bring in near-symplectic techniques and I will describe my ongoing pseudo-holomorphic attempt(s) at analyzing them.