[Tugindia] Query with \newlist

[Kannan Moudgalya]

Sebastian Vattamattam wrote:
> I have a problem: How to place two matrices side-by-side to show their 
> product. Hope someone could help me.
> Sebastian Vattamattam
>   
Please see below a working code.  Detailed, spoken, tutorials on how to 
create such equations is available at www.moudgalya.org.

Kannan
======
\documentclass[12pt]{article}
\usepackage{amsmath}
\begin{document}
\begin{align*}
\frac d{dt} \begin{bmatrix} x_1 \\ x_2 \\ x_3 \end{bmatrix} & =
\begin{bmatrix} a & b & c \\ d & e & f \\ g & h & i \end{bmatrix}
\begin{bmatrix} x_1 \\ x_2 \\ x_3 \end{bmatrix}
\end{align*}
\end{document}