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Quasi-reductive (bi)parabolic subalgebras in reductive Lie algebras.

Karin Baur, Anne Moreau (2011)

Annales de l’institut Fourier

We say that a finite dimensional Lie algebra is quasi-reductive if it has a linear form whose stabilizer for the coadjoint representation, modulo the center, is a reductive Lie algebra with a center consisting of semisimple elements. Parabolic subalgebras of a semisimple Lie algebra are not always quasi-reductive (except in types A or C by work of Panyushev). The classification of quasi-reductive parabolic subalgebras in the classical case has been recently achieved in unpublished work of Duflo,...

Quotients compacts des groupes ultramétriques de rang un

Fanny Kassel (2010)

Annales de l’institut Fourier

Soit G l’ensemble des points d’un groupe algébrique semi-simple connexe de rang relatif un sur un corps local ultramétrique. Nous décrivons tous les sous-groupes discrets de type fini sans torsion de  G × G qui agissent proprement et cocompactement sur  G par multiplication à gauche et à droite. Nous montrons qu’après une petite déformation dans  G × G un tel sous-groupe agit encore librement, proprement discontinûment et cocompactement sur  G .

Quotients of Strongly Realcompact Groups

L. Morales, M. Tkachenko (2016)

Topological Algebra and its Applications

A topological group is strongly realcompact if it is topologically isomorphic to a closed subgroup of a product of separable metrizable groups. We show that if H is an invariant Čech-complete subgroup of an ω-narrow topological group G, then G is strongly realcompact if and only if G/H is strongly realcompact. Our proof of this result is based on a thorough study of the interaction between the P-modification of topological groups and the operation of taking quotient groups.

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