Removal of semipositivity in the taming criterion for almost complex 4-manifolds
Let be a closed almost complex -manifold. Suppose there exists a closed -form such that, for every , there is a closed connected pseudoholomorphic curve passing through with . Semipositivity-removal conjecture. The semipositivity assumption on in Proposition can be removed; under these hypotheses, admits a taming symplectic structure. This conjecture asks whether homological positivity of the curves alone suffices for the taming criterion, without requiring the auxiliary closed form to be semipositive.
References
Primary source
Spencer Cattalani, “Positivity of Intersections and Tameness of Almost Complex 4-manifolds”, arXiv:2401.17381 (2026).
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