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Soient un groupe algébrique complexe réductif et connexe, un sous-groupe de Borel de et un sous-groupe sphérique de .
Soit un plongement -équivariant de . Nous savons que n’a qu’un nombre fini d’orbites dans ; nous montrons qu’il n’en a qu’un nombre fini dans . Soit l’adhérence dans d’une orbite de dans et l’adhérence d’une orbite de dans . Si est toroïdal, nous montrons que l’intersection est propre dans et la décrivons ensemblistement. Si de plus est lisse,...
Let be a connected reductive subgroup of a complex connected reductive group . Fix maximal tori and Borel subgroups of and . Consider the cone generated by the pairs of strictly dominant characters such that is a submodule of . We obtain a bijective parametrization of the faces of as a consequence of general results on GIT-cones. We show how to read the inclusion of faces off this parametrization.
Soient deux groupes réductifs connexes définis sur un corps algébriquement clos de caractéristique nulle. Notons (resp. ) l’ensemble des classes d’isomorphisme des représentations irréductibles de (resp. de ). Nous nous intéressons à l’ensemble des couples dans pour lesquels un -module de classe contient un sous--module de classe . Il est bien connu que engendre un cône polyédral dans l’espace vectoriel rationnel engendré par le produit du groupe des caractères de avec le...
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