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Smooth affine group schemes over the dual numbers [PDF]

open access: yesÉpijournal de Géométrie Algébrique, 2019
We provide an equivalence between the category of affine, smooth group schemes over the ring of generalized dual numbers $k[I]$, and the category of extensions of the form $1 \to \text{Lie}(G, I) \to E \to G \to 1$ where G is an affine, smooth group ...
Matthieu ROMAGNY, Dajano Tossici
doaj   +1 more source

The parabolic exotic t-structure [PDF]

open access: yesÉpijournal de Géométrie Algébrique, 2018
Let G be a connected reductive algebraic group over an algebraically closed field k, with simply connected derived subgroup. The exotic t-structure on the cotangent bundle of its flag variety T^*(G/B), originally introduced by Bezrukavnikov, has been a ...
Pramod N Achar   +2 more
doaj   +1 more source

Stokes posets and serpent nests [PDF]

open access: yesDiscrete Mathematics & Theoretical Computer Science, 2016
30 pages, 12 ...
Frédéric Chapoton
doaj   +1 more source
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