2018/03/20 by Matej Filip, Filip, Matej · 1 citation
Mathematics · #Algebraic Geometry and Number Theory #Algebraic structures and combinatorial models #Homotopy and Cohomology in Algebraic Topology #math.AG
paper · pdf · doi:10.48550/arxiv.1803.07486
arxiv created 2018/12/01 · arxiv updated 2018/12/04
For an affine toric variety \spec(A), we give a convex geometric interpretation of the Gerstenhaber product \HH2(A)× \HH2(A)→ \HH3(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].