856 citations
- University of CopenhagenDK14 papers
- Consejo Superior de Investigaciones CientíficasES13 papers
- European Southern ObservatoryCL10 papers
- Instituto de Estructura de la MateriaES9 papers
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- Instituto de Astrofísica de AndalucíaES7 papers
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4 papers · 2 filters
On compactifications of the Steinberg zero-fiber
Thomas Haahr Lynderup, Jesper Funch Thomsen
Let G be a connected semisimple linear algebraic group over an algebraically closed field k of positive characteristic and let X denote an equivariant embedding of G. We define a d…
Closures of Steinberg fibers in twisted wonderful compactifications
Xuhua He, Jesper Funch Thomsen
By a case-free approach we give a precise description of the closure of a Steinberg fiber within a twisted wonderful compactification of a simple linear algebraic group. In the non…
Schubert Unions in Grassmann Varieties
Johan P. Hansen, Trygve Johnsen, Kristian Ranestad
We study subsets of Grassmann varieties G(l,m) over a field F, such that these subsets are unions of Schubert cycles, with respect to a fixed flag. We study the linear spans of, an…
Frobenius splitting of equivariant closures of regular conjugacy classes
Jesper Funch Thomsen
Let denote a connected semisimple and simply connected algebraic group over an algebraically closed field of positive characteristic and let denote a regular element of…