简介：利用对称内积的Schmidt正交化方法证明了各阶主子式不为零对称阵的LDLT分解.引入两个向量组关于弱内积广义正交的概念,并构造了将两组含相同个数向量的线性无关组化为广义正交组的广义Schmidt正交化方法.最后应用这一方法证明了各阶主子式不为零矩阵的LDU分解及一些相关的结果.

简介：用简单的方法证明了矩阵LU分解定理，讨论了定理的推广以及定理相应的数值实现，并对《数值分析》课程教学方法改革进行了思考．

简介：LuJingshan(born10June1985),professionallyknownasCelinaJade,isanactress,singer-songwriter,modelandmartialartist.InternationallysheisbestknownforherroleasShado(andMei)inthe2010sCWseriesArrow.InChinashe'sbestknownforstarringinthe2017blockbusterWolfWarrior2,thehighest-grossingChinesefilmever.

简介：LuXunisoneofthegreatestChinesewritersofthe20thcentury.Besideshisfamousstories,healsowrotemanyinfluential（有影响力的）articlesaboutthelivingconditionsofChinesepeople.

简介：<正>OnceatimeacommentatorsaidthattherehadbeenthreegreatestgeniusscholarsinChina.OneisConfucius(551BC-479BC)wellknownastheChineseSage,anotherispoetLiPo(701-762)asaDivinePoetofChina,andstillanotherisLuXun(1881-1936)asaGeneralCommanderoftheChineseLiterature.Approximatelyeveryother1300-years,oneofthemwasbornconsecutively.

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简介：LUShou-yan(1909-1969),afamousacupuncturistandacupunctureeducatorinChina.Headheredtodofamilylearning,andmergedChineseandWesternmedicine.Hisskilledanduniqueacupunctureoperationgotwonderfultherapeuticeffects.Hestudiedthereinforcing-reducingmethodsofmountain-fireburningandheaven-penetratingcoolingindepth,andcreatedthebeginningofacupuncture-moxibustionexperiments.Hecreatedthe'New-ChinaAcupunctureResearchAssociation'andacupuncturecorrespondenceclass,setupacupuncturestudyclassofLUShou-yanandZHURu-gong,cultivatedalargenumberofacupuncture-moxibustiontalentedpersons.Inaddition,hedevelopedanadult-sizedmotor-operatedglassteachingmodelcontainingmeridiansandacupoints,providedtheearliestmodernvisualaidforacupuncture-

简介：ＳｔｒｏｎｇＳｉｇｎａｔｕｒｅＤｅｐｅｎｄｅｎｃｅｏｆＹｒａｓｔＬｅｖｅｌｓｉｎ１６２Ｌｕ￥ＺｈａｎｇＹｕｈｕ；ＺｈｏｕＸｉａｏｈｏｎｇ；ＺｈａｏＱｉｎｇｚｈｏｎｇ；ＳｕｎＸｉａｎｇｆｕ；ＬｅｉＸｉａｎｇｇｕｏ；ＧｕｏＹｉｎｇｘｉａ?..

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简介：KingHammurapiofBabylon(ca.1792-1750B.C.)iswell-knownasaleaderofraregiftsandboldstrategyintheOldBabylonianperiod,whilethedeedsofhisworthyofficialsandgreatgeneralsareovershadowedandlesswellknown.Infact,however,itisnexttoimpossibleforonetobecomeagreatleaderinagreatundertakingwithouttheassistanceofvariousablepersons.Thepresentarticleisanattempttopresentsomeinformationontheroleofoneoftheseofficials,whohelpedtoadministerthegreatempireassembledbyHammurapi.

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简介：1.ContactInformationTheDepartmentofEcologyandEvolutionaryBiology,SchoolofLifeSciences,FudanUniversity,220HandanRoad,Shanghai200433,ChinaPhone:+86-21-65643668(O)E-mail:brlu@fudan.edu.cn2.PresentRanksProfessor,FudanUniversity(Since2000)

简介：力和速度同是矢量,所以速度的分解同样是高中学生必须掌握的一种技能.但由于受力的分解思维定势的影响,部分同学往往把合运动的实际效果与合力的作用效果混为一谈,再加上运动具有相对性,对哪是合运动,哪是分运动不易看出,所有这些问题不但防碍了学生正确解答速度的分解问题,甚至对于正确的结论感到怀疑.为了解决存在的问题,笔者列出了以下例题,也许对解决这类问题有所帮助.

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简介：breakup意为“打碎;分裂;解体;散(会);放假;分解”。【经典例旬】Thesinginggroupbrokeupsoonaftertheybecamefamous.这个演唱组合在成名后不久就解散了。

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简介：在学习分解因式的过程中,同学们最容易犯的错误就是分解不彻底.所以,在进行分解时,要常常问一问自己:还可以继续分解吗?一、提取公因式后还可以用平方差公式分解

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简介：分解质因数，方法是短除。除数是质数，商也是质数。