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math.RT2022★ 1 cited
Semisimple elements and the little Weyl group of real semisimple -graded Lie algebras
Willem de Graaf, Hông Vân Lê
We consider the semisimple orbits of a Vinberg -representation. First we take the complex numbers as base field. By a case by case analysis we show a technical result stating th…
math.GR2022
Non-virtually abelian discontinuous group actions vs. proper SL(2,R)-actions on homogeneous spaces
Maciej Bochenski, Willem A. de Graaf, Piotr Jastrzebski +1
We develop algorithms and computer programs which verify criteria of properness of discrete group actions on semisimple homogeneous spaces. We apply these algorithms to find new ex…