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Ivancevic_Applied-Diff-Geom

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<strong>Applied</strong> Manifold <strong>Geom</strong>etry 237Some real Lie groups and their Lie algebras:LiegroupDescription Remarks Liealgb.R n Euclidean spacewith additionR × nonzero realnumbers withmultiplicationR >0 positive realnumbers withmultiplicationS 1 = complex numbersR/Z of absolute value1, with multiplicationH × non–zero quaternionswith multiplicationS 3 quaternions ofabsolute value 1,with multiplication;a 3−sphereGL(n, R) general lineargroup: invertiblen−by-n real matricesGL + (n, R) n−by-n real matriceswith positivedeterminantAbelian, simplyconnected, notcompactAbelian, not connected,not compactAbelian, simplyconnected, notcompactAbelian, connected,not simplyconnected,compactsimply connected,not compactsimplyconnected, compact,simple andsemi–simple, isomorphicto SU(2), SO(3)and to Spin(3)not connected,not compactsimply connected,not compactR nRRRDescriptionthe Lie bracket iszerothe Lie bracket iszerothe Lie bracket iszerothe Lie bracket iszeroH quaternions, withLie bracket thecommutatorR 3 real 3−vectors,with Lie bracketthe cross product;isomorphicto su(2) and toso(3)M(n, R) n−by-n matrices,with Lie bracketthe commutatorM(n, R) n−by-n matrices,with Lie bracketthe commutatordim/Rn11143n 2n 2

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