Abstract

We define the ℤ2 Hodge spacesH pq (Σ) of a rational fan Σ. If Σ is the normal fan of a reflexive polytope Δ then we use polyhedral duality to compute the Σ2 Hodge Spaces of Σ. In particular, if the cones of dimension at most e in the face fan Σ* of Δ are smooth then we computeH pq (Σ) forp <e − 1. If Σ* is a smooth fan then we completely determine the spacesH pq (Σ) and we showX Σ is maximal, meaning that the sum of the ℤ2 Betti numbers ofX Σ(ℝ) is equal to the sum of the ℤ2 Betti numbers ofX Σ(ℂ).

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