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The Hodge ring of varieties in positive characteristic
Algebra & Number Theory  (IF0.938),  Pub Date : 2021-05-20, DOI: 10.2140/ant.2021.15.729
Remy van Dobben de Bruyn

Let $k$ be a field of positive characteristic. We prove that the only linear relations between the Hodge numbers ${h}^{i,j}\left(X\right)=dim\phantom{\rule{0.3em}{0ex}}{H}^{j}\left(X,{\Omega }_{X}^{i}\right)$ that hold for every smooth proper variety $X$ over $k$ are the ones given by Serre duality. We also show that the only linear combinations of Hodge numbers that are birational invariants of $X$ are given by the span of the ${h}^{i,0}\left(X\right)$ and the ${h}^{0,j}\left(X\right)$ (and their duals ${h}^{i,n}\left(X\right)$ and ${h}^{n,j}\left(X\right)$). The corresponding statements for compact Kähler manifolds were proven by Kotschick and Schreieder.