AB, BA: 相同的 特征值 how? 证明: AB, BA 相似 =》其 特征值 相同,特征向量 maybe 不同 if 特征值为0 =》无法得到 可逆矩阵 =》 无法 使用相似 不同矩阵 —— 特征值 不可直接 运算:加、减、乘、除 特征值(A) * 特征值(B)!= 特征值(AB) 特征值(A) + 特征值(B)!= 特征值(A + B) ...
More than 90% of the pesticides residues in apples are located in the peel. We developed a gas chromatography/ion trap tandem mass spectrometry method for investigating all detectable residues in the peel of 3 apple varieties. Sample preparation is based on the use of the Quick Easy Cheap Effe...
Given two square matrices A, B of the same size, the two matrices AB and BA may have different ranks. A non-zero square matrix A is called a rank-commutator of a family L of n x n matrices if rank(AL) = rank(LA) holds for every L in L. In this paper, we investigate the ...
百度试题 结果1 题目Find AB and BA, if possible.A=(bmatrix) -1&3 -3&2(bmatrix), B=(bmatrix) -2&4&0 -3&-1&2(bmatrix) 相关知识点: 试题来源: 解析 AB=(bmatrix) -7&-7&6 0&-14&4(bmatrix) ; BA is undetined.反馈 收藏 ...
In general AB≠ BA even when m = n = p, so it is necessary to distinguish between premultiplication and postmultiplication. For a square matrix A of order n, powers are defined A0=I, A1=A, A2=A·A, A3=A·A2,etc. A polynomial function of A is a square matrix of order n given...
If A and B are nonsingular matrices, then AB is nonsingular. Thus, (AB)-1= B-1A-1 If A is nonsingular then (AT)-1= (A-1)T If A is any matrix and A-1is its inverse, then AA-1= A-1A = In, where n is the order of matrices ...
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If A is any mxxn matrix such that AB and BA are both defined, then B is a matrix of order
百度试题 结果1 题目Find AB and BA, if possible.A=(bmatrix) -1&6&0 3&-2&1(bmatrix), B=(bmatrix) \ 2&-4 -1&3(bmatrix) 相关知识点: 试题来源: 解析 AB is undefined; BA=(bmatrix) -14&20&4 10&-12&3(bmatrix) 反馈 收藏 ...
Multiplication of diagonal matrices is commutative: if A and B are diagonal, then C = AB = BA. iii. If A is diagonal, and B is a general matrix, and C = AB, then the ith row of C is aii times the ith row of B; if C = BA, then the ith column of C is aii times the ...