EntityQ634557· pop 19· linked from 124 articlesKilling formSign in to saveinvariant symmetric bilinear form defined on Lie algebra; trace of composition of two adjoint representationsConnectionsLie algebraEntityorthogonal groupEntityadjoint representationEntityCasimir invariantEntityCartan's criterionEntitymathematicsEntityphysicsEntityInternational Standard Book NumberEntitycomplex numberEntityHenri PoincaréEntitydigital object identifierEntityHermann WeylEntityOCLC, Inc.EntityfieldEntitytensorEntitySophus LieEntityCambridge University PressEntityÉlie CartanEntitytraceEntityorthogonalityEntityCategoriesLie algebrasLie groups