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math.AG2020
A Surface Degeneration With Non-Collapsible Contractible Dual Complex
Lev Soukhanov
We construct a smoothing of a particular normal crossing surface, which dual complex is a duncehat, thus obtaining an example of a surface degeneration with non-collapsible, contra…
math.AG2020★ 3 cited
Perverse schobers and the Algebra of the Infrared
Mikhail Kapranov, Yan Soibelman, Lev Soukhanov
We relate the Algebra of the Infrared of Gaiotto-Moore-Witten with the theory of perverse schobers which are (conjectural, in general) categorical analogs of perverse sheaves. A pe…