Volume 8 (2025)
Chenal, Jules
A Poincaré–Lefschetz Theorem for Cellular Cosheaves and an Application to the Tropical Homology of Orbifold Toric Varieties
Annales Henri Lebesgue, Volume 8 (2025), pp. 277-327.

Metadata

DOI10.5802/ahl.236
Keywords Poincaré–Leschetz theorem, tropical homology, tropical Lefschetz hyperplan theorem

Abstract

We begin by presenting a version of the Poincaré–Lefschetz theorem for certain cellular cosheaves on a particular subdivision of a CW-complex $K$. To that end we construct a cellular sheaf on $K$ whose cohomology with compact support is isomorphic to the homology of the initial cosheaf. Thereafter we use the first result to generalise the tropical version of the Lefschetz Hyperplane Section Theorem to some singular tropical toric varieties and singular tropical hypersurfaces.


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