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arXiv 1803.07486math.AG
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仿射复曲面簇的Gerstenhaber积$\HH^2(A)\times \HH^2(A)\to \HH^3(A)$

The Gerstenhaber product $\HH^2(A)\times \HH^2(A)\to \HH^3(A)$ of affine toric varieties

Matej Filip

摘要:

对于仿射复曲面簇$\spec(A)$,给出了Hochschild上同调群之间Gerstenhaber积$\HH^2(A)\times \HH^2(A)\to \HH^3(A)$的凸几何解释.在Gorenstein复曲面的情况下,我们证明了Gerstenhaber产品是零映射。作为交换变形理论中的应用,我们发现了不一定孤立的复曲面Gorenstein奇异性的二阶以下的双底空间(在特殊的格度)的方程。我们的构造改进和推广了[1]和[13]中的结果。

英文摘要:

For an affine toric variety $\spec(A)$, we give a convex geometric interpretation of the Gerstenhaber product $\HH^2(A)\times \HH^2(A)\to \HH^3(A)$ between the Hochschild cohomology groups. In the case of Gorenstein toric surfaces we prove that the Gerstenhaber product is the zero map. As an application in commutative deformation theory we find the equations of the versal base space (in special lattice degrees) up to second order for not necessarily isolated toric Gorenstein singularities. Our construction reproves and generalizes results obtained in [1] and [13].

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