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2018-11-27T12:03:41.000000Z
字数 2034
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29 If is a 2 by 2 matrix of rank 1, redraw Figure 3.5 to show clearly the Four Fundamental Subspaces. If B produces those same four subspaces, what is the exact relation of B to A?
解:A与B有相同的四大基本子空间,B=xA(x是一个列向量)。
30 M is the space of 3 by 3 matrices. Multiply every matrix X in M by
(b)X是所有的3*3矩阵,AX=b,相当于求其列空间,跟据秩定理,该空间的秩为6,基有六个矩阵组成,类比向量作为基的情况,列空间就是A的线性组合,该空间有6个基
31 Suppose the m by n matrices A and B have the same four subspaces. If they are both in row reduced echelon form, prove that F must equal G:
修正:
本来的想法:A=cB,Ax=cBx=Bcx=0,零空间是相同的,行空间的基是简化阶梯型的前r行,既行空间最佳的基。说明对应的每一行是要相同的。