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1、AnElementaryIntroductiontoGroupsandRepresentationsBrianC.HallAuthoraddress:UniversityofNotreDame,DepartmentofMathematics,NotreDameIN46556USAE-mailaddress:bhall@nd.eduarXiv:math-ph/000503231May2000Contents1.PrefaceiiChapter1.Groups11.DenitionofaGroup,andBasicProperties12.Som
2、eExamplesofGroups33.Subgroups,theCenter,andDirectProducts44.HomomorphismsandIsomorphisms55.Exercises6Chapter2.MatrixLieGroups91.DenitionofaMatrixLieGroup92.ExamplesofMatrixLieGroups103.Compactness154.Connectedness165.Simple-connectedness186.HomomorphismsandIsomorphisms197.L
3、ieGroups208.Exercises22Chapter3.LieAlgebrasandtheExponentialMapping271.TheMatrixExponential272.ComputingtheExponentialofaMatrix293.TheMatrixLogarithm314.FurtherPropertiesoftheMatrixExponential345.TheLieAlgebraofaMatrixLieGroup366.PropertiesoftheLieAlgebra407.TheExponentialMa
4、pping448.LieAlgebras469.TheComplexicationofaRealLieAlgebra4810.Exercises50Chapter4.TheBaker-Campbell-HausdorFormula531.TheBaker-Campbell-HausdorFormulafortheHeisenbergGroup532.TheGeneralBaker-Campbell-HausdorFormula563.TheSeriesFormoftheBaker-Campbell-HausdorFormula634.
5、SubgroupsandSubalgebras645.Exercises65Chapter5.BasicRepresentationTheory671.Representations672.WhyStudyRepresentations?69iiiivCONTENTS3.ExamplesofRepresentations704.TheIrreducibleRepresentationsofsu(2)755.DirectSumsofRepresentationsandCompleteReducibility796.TensorProductsof
6、Representations827.Schur'sLemma868.GroupVersusLieAlgebraRepresentations889.CoveringGroups9410.Exercises96Chapter6.TheRepresentationsofSU(3),andBeyond1011.Preliminaries1012.WeightsandRoots1033.HighestWeightsandtheClassicationTheorem1054.ProofoftheClassicationTheorem1075.AnE
7、xample:HighestWeight(1;1)1116.TheWeylGroup1127.ComplexSemisimpleLieAlgebras1158.Exercises117Chapter7.Cumulativeexercises119Chapter8.Bibliography1211.PREFACEv1.PrefaceThesenotesaretheoutgrowthofagraduatecourseonLiegroupsItaughtattheUniversityofVirginiain1994.Intryingtondatex
8、tforthecourseIdiscoveredthatbooksonLiegroupseitherpresupposeaknowledgeofdi
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