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arxiv: 1711.06931 · v1 · pith:4YO6FQAWnew · submitted 2017-11-18 · 🧮 math.AG · math.AC

Koszul duality between Betti and Cohomology numbers in Calabi-Yau case

classification 🧮 math.AG math.AC
keywords betticalabi-yaucohomologyformulaskoszulnumbersbox-productbundle
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Let $X$ be a smooth projective Calabi-Yau variety and $L$ a Koszul line bundle on $X$. We show that for Betti numbers of a maximal Cohen-Macaulay module over the homogeneous coordinate ring $A$ of $X$ there are formulas similar to the formulas for cohomology number. This similarity is realized via the box-product resolution of the diagonal $\Delta_X \subset X \times X$.

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