Poincar\'e Duality, Degeneracy, and Real Lefschetz Property for T-Hypersurfaces

In this article, we present two structural results about the Renaudineau-Shaw spectral sequence that computes the cohomology of T-hypersurfaces.

The first is a Poincaré duality satisfied by all its pages of positive index.

The second is a vanishing criterion.

It reformulates the vanishing of the boundary operators of the spectral sequence as the injectivity of some morphisms induced in cohomology by the inclusion of the T-hypersurface in its surrounding toric variety.

It implies that the Renaudineau-Shaw spectral sequence of a T-hypersurface degenerates at the second page if and only if the T-hypersurface satisfies a real version of the Lefschetz Hyperplane Section Theorem.