Spherical actions on flag varieties
Sbornik. Mathematics, Tome 205 (2014) no. 9, pp. 1223-1263

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For every finite-dimensional vector space $V$ and every $V$-flag variety $X$ we list all connected reductive subgroups in $\mathrm{GL}(V)$ acting spherically on $X$. Bibliography: 28 titles.
Keywords: flag variety, spherical variety, nilpotent orbit.
Mots-clés : algebraic group
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     author = {R. S. Avdeev and A. V. Petukhov},
     title = {Spherical actions on flag varieties},
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R. S. Avdeev; A. V. Petukhov. Spherical actions on flag varieties. Sbornik. Mathematics, Tome 205 (2014) no. 9, pp. 1223-1263. http://geodesic.mathdoc.fr/item/SM_2014_205_9_a0/