EntityQ534131· pop 17· linked from 220 articlesroot systemSign in to savegeometric arrangements of points, foundational to Lie theoryConnectionsorthogonal groupEntityCoxeter groupEntitysemisimple Lie algebraEntityadjoint representationEntitymathematicsEntityphysicsEntityInternational Standard Book NumberEntitycomplex numberEntityintegerEntityrootEntityHenri PoincaréEntitycubeEntitydigital object identifierEntitycoordinate systemEntitygroupEntityvector spaceEntitycombinatoricsEntityHermann WeylEntityscalar productEntityparityEntityCategoriesEuclidean geometryLie algebrasLie groups