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zylo October 9th, 2015 07:39 AM

Why Doesn't This Work
 
Consider Ax=0

$\displaystyle \begin{vmatrix}
a_1_1\\
a_2_1\\
a_3_1\\
a_4_1\\
a_5_1
\end{vmatrix}x_1 + \begin{vmatrix}
a_1_2\\
a_2_2\\
a_3_2\\
a_4_2\\
a_5_2
\end{vmatrix} x_2 +\begin{vmatrix}
a_1_3\\
a_2_3\\
a_3_3\\
a_4_3\\
a_5_3
\end{vmatrix} x_3 =0$

zylo October 9th, 2015 08:43 AM

But this works!?

$\displaystyle \begin{pmatrix}
a1 &a2 &a3 \\
b1 &b2 &b3
\end{pmatrix} x_1=0$

zylo October 9th, 2015 10:02 AM

$\displaystyle \begin{vmatrix}
a11\\
a21\\
a31\\
a41\\
a51
\end{vmatrix}x1+\begin{vmatrix}
a12\\
a22\\
a32\\
a42\\
a52
\end{vmatrix}x2+\begin{vmatrix}
a13\\
a23\\
a33\\
a43\\
a53
\end{vmatrix}x3=0$

It didn't like double subscripts in the matrix. a1_1 ok, a_1_1 ng

skipjack October 9th, 2015 11:24 AM

I suspect you want this:

$\displaystyle \begin{vmatrix}
a_{11} \\
a_{21} \\
a_{31} \\
a_{41} \\
a_{51}
\end{vmatrix}x_1 + \begin{vmatrix}
a_{12} \\
a_{22} \\
a_{32} \\
a_{42} \\
a_{52}
\end{vmatrix} x_2 +\begin{vmatrix}
a_{13} \\
a_{23} \\
a_{33} \\
a_{43} \\
a_{53}
\end{vmatrix} x_3 = 0$


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