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ID:52399020
大小:1.45 MB
页数:48页
时间:2020-04-05
《逆变换与逆矩矩阵的特征向量.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5Clie
2、ntProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.一、逆变换与逆矩阵1.设ρ是一个线性变换,如果存在线性变换σ,使得,则称变换ρ可逆,并且称σ是ρ的逆变换.2.设A是一个二阶矩阵,如果存在二阶矩阵B,使得,则称矩阵A可逆,或称矩阵A是可逆矩阵,并且称B是A的逆矩
3、阵.σρ=ρσ=IBA=AB=E2Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.3.逆矩阵的性质性质1.设A是一个二阶矩阵,如果A是可逆的,则A的逆矩阵
4、是_____的.性质2.设A,B是二阶矩阵,如果A,B都可逆,则AB也可逆,且________________.唯一(AB)-1=B-1A-1Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright20
5、04-2011AsposePtyLtd.4.定理:二阶矩阵A=可逆,当且_____________.detA=ad-bc≠0Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011Aspo
6、sePtyLtd.二、逆矩阵与二元一次方程组1.定理:如果关于变量x,y的二元一次方程组(线性方程组)的系数矩阵A=可逆,那么该方程组有唯一解Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004
7、-2011AsposePtyLtd.2.推论:关于变量x,y的二元一次方程组其中a,b,c,d是不全为零的常数,有非零解的充分必要条件是系数矩阵的行列式____________.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2
8、.0.0.Copyright2004-2011AsposePtyLtd.三、特征向量定义设矩阵A=,如果存在数λ以及非零向量ξ,使得,则称λ是矩阵A的一个特征值,ξ是矩阵A的属于特征值λ的一个特征向量.Aξ=λEvaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.Evaluatio
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