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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