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math.AG2003★ 2 cited
Perverse sheaves, Koszul IC-modules, and the quiver for the category O
Maxim Vybornov
For a stratified topological space we introduce the category of IC-modules, which are linear algebra devices with the relations described by the equation d^2=0. We prove that the c…
math.AG2003★ 3 cited
The minimal degeneration singularities in the affine Grassmannians
Anton Malkin, Viktor Ostrik, Maxim Vybornov
The minimal degeneration singularities in the affine Grassmannians of simple simply-laced algebraic groups are determined to be either Kleinian singularities of type A, or closures…