action de groupeAction d'un groupe topologiqueAction de groupe cocompacteAction transitiveFormule des classes
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En mathématiques, une action d'un groupe sur un ensemble est une loi de composition externe du groupe sur l'ensemble, vérifiant des conditions supplémentaires.
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En mathématiques, une action d'un groupe sur un ensemble est une loi de composition externe du groupe sur l'ensemble, vérifiant des conditions supplémentaires.
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