If D_1 and D_2 are two 3 times 3 diagonal mat | vedclass

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Question

Let $D_1 =$ $\left[ {\begin{array}{*{20}{c}}{{x_1}}&0&0\0&{{y_1}}&0\0&0&{{z_1}}\end{array}} ight]$  and $D_2 =$ $\lef

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All of the bove

Vedclass · Answer

Let $D_1 =$ $\left[ {\begin{array}{*{20}{c}}{{x_1}}&0&0\0&{{y_1}}&0\0&0&{{z_1}}\end{array}} ight]$  and $D_2 =$ $\left[ {\begin{array}{*{20}{c}}{{x_2}}&0&0\0&{{y_2}}&0\0&0&{{z_2}}\end{array}} ight]$, when $x_1 , y_1 , z_1 , x_2 , y_2 , z_2 
eq  0$
then $D_1D_2 = D_2D_1$

If $D_1$ and $D_2$ are two $3 \times 3$ diagonal matrices, then

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