Removal of semipositivity in the taming criterion for almost complex 4-manifolds

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Let (X,J)(X,J) be a closed almost complex 44-manifold. Suppose there exists a closed 22-form ϕ\phi such that, for every x∈Xx\in X, there is a closed connected pseudoholomorphic curve CxC_x passing through xx with ∫Cxϕ>0\int_{C_x}\phi>0. Semipositivity-removal conjecture. The semipositivity assumption on ϕ\phi in Proposition can be removed; under these hypotheses, (X,J)(X,J) 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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